Candy-piの接続について

raspberry pi4 OS:debian10.8
Linux raspberrypi 5.10.11-v7l+ #1399 SMP Thu Jan 28 12:09:48 GMT 2021 armv7l GNU/Linux

candy-piはコマンドでインストールしました。
curl -sL https://git.io/v7bXx | sudo bash
candy-pi-lite.service - CANDY Pi Lite Service, version:10.2.1

sudo vi /boot/apn
{
“apn”: “mopera.net”,
“user”: “aaa”,
“password”: “bbb”,
“cs”: false
}

の環境で動かしています。
電源を入れると接続できるのに今までは10分ぐらいかかりました。
しかし2/25今日は2分程度で接続します。
5回ほどしてみたが、全て2分程度で接続します。
なぜ今日は接続できるのかわかりません。

接続できなかった時のlogです。
Modem hangup があると接続失敗したというところまでしかわかりませんでした。
失敗した要因と対策が分かれば教えてください。

Feb 24 17:08:17 raspberrypi candy-pi-lite: [ERROR] PPP cannot be online
Feb 24 17:08:17 raspberrypi pppd[3459]: Terminating on signal 15
Feb 24 17:08:17 raspberrypi pppd[3459]: Connection terminated.
Feb 24 17:08:17 raspberrypi pppd[3459]: Serial link disconnected.
Feb 24 17:08:18 raspberrypi pppd[3459]: Exit.
Feb 24 17:08:18 raspberrypi candy-pi-lite: [INFO] start_pppd.sh terminated: Exit Code => 5
Feb 24 17:08:19 raspberrypi candy-pi-lite: [INFO] Trying to connect…(Trial:2/3, Timeout:35sec)
Feb 24 17:08:19 raspberrypi candy-pi-lite: [INFO] Starting PPP: /dev/QWS.EC25.MODEM
Feb 24 17:08:19 raspberrypi pppd[3532]: pppd 2.4.7 started by root, uid 0
Feb 24 17:08:21 raspberrypi pppd[3532]: Connect script failed
Feb 24 17:08:22 raspberrypi pppd[3532]: Exit.
Feb 24 17:08:22 raspberrypi candy-pi-lite: [INFO] start_pppd.sh terminated: Exit Code => 8
Feb 24 17:08:22 raspberrypi candy-pi-lite: [ERROR] PPP cannot be online
Feb 24 17:08:22 raspberrypi candy-pi-lite: [INFO] Trying to connect…(Trial:3/3, Timeout:65sec)
Feb 24 17:08:22 raspberrypi candy-pi-lite: [INFO] Starting PPP: /dev/QWS.EC25.MODEM
Feb 24 17:08:22 raspberrypi pppd[3578]: pppd 2.4.7 started by root, uid 0
Feb 24 17:08:23 raspberrypi systemd[1]: systemd-timedated.service: Succeeded.
Feb 24 17:08:24 raspberrypi pppd[3578]: Serial connection established.
Feb 24 17:08:24 raspberrypi pppd[3578]: Using interface ppp0
Feb 24 17:08:24 raspberrypi pppd[3578]: Connect: ppp0 <–> /dev/QWS.EC25.MODEM
Feb 24 17:08:25 raspberrypi pppd[3578]: CHAP authentication succeeded
Feb 24 17:08:25 raspberrypi pppd[3578]: CHAP authentication succeeded
Feb 24 17:08:25 raspberrypi pppd[3578]: Modem hangup
Feb 24 17:08:25 raspberrypi pppd[3578]: Connection terminated.
Feb 24 17:08:26 raspberrypi pppd[3578]: Exit.
Feb 24 17:08:26 raspberrypi candy-pi-lite: [INFO] start_pppd.sh terminated: Exit Code => 16
Feb 24 17:08:26 raspberrypi candy-pi-lite: [ERROR] PPP cannot be online
Feb 24 17:08:26 raspberrypi candy-pi-lite: [WARN] Failed to establishing a connection. Retry after 30 seconds…
Feb 24 17:08:57 raspberrypi kernel: [ 362.188723] usb 1-1.1: USB disconnect, device number 10
Feb 24 17:08:57 raspberrypi kernel: [ 362.189134] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
Feb 24 17:08:57 raspberrypi kernel: [ 362.189192] option 1-1.1:1.0: device disconnected
Feb 24 17:08:57 raspberrypi kernel: [ 362.189606] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
Feb 24 17:08:57 raspberrypi kernel: [ 362.189666] option 1-1.1:1.1: device disconnected
Feb 24 17:08:57 raspberrypi kernel: [ 362.190068] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
Feb 24 17:08:57 raspberrypi kernel: [ 362.190139] option 1-1.1:1.2: device disconnected
Feb 24 17:08:57 raspberrypi kernel: [ 362.190679] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
Feb 24 17:08:57 raspberrypi kernel: [ 362.190752] option 1-1.1:1.3: device disconnected
Feb 24 17:08:57 raspberrypi kernel: [ 362.190968] qmi_wwan 1-1.1:1.4 wwan0: unregister ‘qmi_wwan’ usb-0000:01:00.0-1.1, WWAN/QMI device
Feb 24 17:08:57 raspberrypi candy-pi-lite: [ERROR] The path [/dev/QWS.EC25.MODEM] is missing
Feb 24 17:08:57 raspberrypi candy-pi-lite: [ERROR] The path [/dev/QWS.EC25.MODEM] is missing
Feb 24 17:08:57 raspberrypi candy-pi-lite: [ERROR] No serialport is available, will restart after 10 seconds
Feb 24 17:09:07 raspberrypi systemd[1]: candy-pi-lite.service: Main process exited, code=exited, status=5/NOTINSTALLED
Feb 24 17:09:07 raspberrypi systemd[1]: candy-pi-lite.service: Failed with result ‘exit-code’.
Feb 24 17:09:07 raspberrypi systemd[1]: candy-pi-lite.service: Service RestartSec=100ms expired, scheduling restart.
Feb 24 17:09:07 raspberrypi systemd[1]: candy-pi-lite.service: Scheduled restart job, restart counter is at 1.
Feb 24 17:09:07 raspberrypi systemd[1]: Stopped CANDY Pi Lite Service, version:10.2.1.
Feb 24 17:09:07 raspberrypi systemd[1]: Started CANDY Pi Lite Service, version:10.2.1.
Feb 24 17:09:08 raspberrypi candy-pi-lite: [INFO] Initializing CANDY Pi Lite Board…
Feb 24 17:09:09 raspberrypi candy-pi-lite: [INFO] Looking for a Modem Serial port at Barudrate: 115200…
Feb 24 17:09:10 raspberrypi candy-pi-lite: [INFO] Result: None
Feb 24 17:09:10 raspberrypi candy-pi-lite: [INFO] Looking for a Modem Serial port at Barudrate: 460800…
Feb 24 17:09:11 raspberrypi candy-pi-lite: [INFO] Result: None
Feb 24 17:09:11 raspberrypi candy-pi-lite: [INFO] Looking for a Modem Serial port at Barudrate: 115200…
Feb 24 17:09:12 raspberrypi candy-pi-lite: [INFO] Result: None
Feb 24 17:09:12 raspberrypi candy-pi-lite: [INFO] Looking for a Modem Serial port at Barudrate: 460800…
Feb 24 17:09:12 raspberrypi candy-pi-lite: [INFO] Result: None
Feb 24 17:09:14 raspberrypi candy-pi-lite: [INFO] Looking for a Modem Serial port at Barudrate: 115200…
Feb 24 17:09:14 raspberrypi candy-pi-lite: [INFO] Result: None
Feb 24 17:09:14 raspberrypi candy-pi-lite: [INFO] Looking for a Modem Serial port at Barudrate: 460800…
Feb 24 17:09:15 raspberrypi candy-pi-lite: [INFO] Result: None
Feb 24 17:09:16 raspberrypi candy-pi-lite: [INFO] Looking for a Modem Serial port at Barudrate: 115200…
Feb 24 17:09:17 raspberrypi candy-pi-lite: [INFO] Result: None
Feb 24 17:09:17 raspberrypi candy-pi-lite: [INFO] Looking for a Modem Serial port at Barudrate: 460800…
Feb 24 17:09:18 raspberrypi candy-pi-lite: [INFO] Result: None
Feb 24 17:09:19 raspberrypi candy-pi-lite: [INFO] Looking for a Modem Serial port at Barudrate: 115200…
Feb 24 17:09:20 raspberrypi candy-pi-lite: [INFO] Result: /dev/ttySC1
Feb 24 17:09:20 raspberrypi candy-pi-lite: [INFO] Modem Serial port: /dev/ttySC1 and AT Serial port: /dev/ttySC1 are selected
Feb 24 17:09:20 raspberrypi candy-pi-lite: [INFO] Initializing modem with baudrate:460800
Feb 24 17:09:21 raspberrypi kernel: [ 386.803957] usb 1-1.1: new high-speed USB device number 11 using xhci_hcd
Feb 24 17:09:21 raspberrypi candy-pi-lite: [INFO] Modem baudrate changed: 115200 => 460800
Feb 24 17:09:21 raspberrypi candy-pi-lite: [INFO] Initialization Done. Modem Serial Port => /dev/ttySC1 Modem baudrate => 460800
Feb 24 17:09:21 raspberrypi kernel: [ 386.943994] usb 1-1.1: New USB device found, idVendor=2c7c, idProduct=0125, bcdDevice= 3.18
Feb 24 17:09:21 raspberrypi kernel: [ 386.944006] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Feb 24 17:09:21 raspberrypi kernel: [ 386.944014] usb 1-1.1: Product: Android
Feb 24 17:09:21 raspberrypi kernel: [ 386.944021] usb 1-1.1: Manufacturer: Android
Feb 24 17:09:21 raspberrypi kernel: [ 386.953449] option 1-1.1:1.0: GSM modem (1-port) converter detected
Feb 24 17:09:21 raspberrypi kernel: [ 386.953631] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0
Feb 24 17:09:21 raspberrypi kernel: [ 386.953906] option 1-1.1:1.1: GSM modem (1-port) converter detected
Feb 24 17:09:21 raspberrypi kernel: [ 386.954086] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1
Feb 24 17:09:21 raspberrypi kernel: [ 386.954360] option 1-1.1:1.2: GSM modem (1-port) converter detected
Feb 24 17:09:21 raspberrypi kernel: [ 386.954527] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2
Feb 24 17:09:21 raspberrypi kernel: [ 386.954801] option 1-1.1:1.3: GSM modem (1-port) converter detected
Feb 24 17:09:21 raspberrypi kernel: [ 386.954965] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB3
Feb 24 17:09:21 raspberrypi kernel: [ 386.956339] qmi_wwan 1-1.1:1.4: cdc-wdm0: USB WDM device
Feb 24 17:09:21 raspberrypi kernel: [ 386.957589] qmi_wwan 1-1.1:1.4 wwan0: register ‘qmi_wwan’ at usb-0000:01:00.0-1.1, WWAN/QMI device, 2a:bb:7d:f1:82:6a
Feb 24 17:09:21 raspberrypi mtp-probe: checking bus 1, device 11: “/sys/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1”
Feb 24 17:09:21 raspberrypi mtp-probe: bus: 1, device: 11 was not an MTP device
Feb 24 17:09:21 raspberrypi systemd-udevd[3808]: Using default interface naming scheme ‘v240’.
Feb 24 17:09:22 raspberrypi mtp-probe: checking bus 1, device 11: “/sys/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1”
Feb 24 17:09:22 raspberrypi mtp-probe: bus: 1, device: 11 was not an MTP device
Feb 24 17:09:22 raspberrypi candy-pi-lite: [INFO] SIM card state => SIM_STATE_READY
Feb 24 17:09:22 raspberrypi dbus-daemon[524]: [system] Activating via systemd: service name=‘org.freedesktop.timedate1’ unit=‘dbus-org.freedesktop.timedate1.service’ requested by ‘:1.40’ (uid=0 pid=3829 comm="timedatectl set-ntp false ")
Feb 24 17:09:22 raspberrypi systemd[1]: Starting Time & Date Service…
Feb 24 17:09:22 raspberrypi dbus-daemon[524]: [system] Successfully activated service ‘org.freedesktop.timedate1’
Feb 24 17:09:22 raspberrypi systemd[1]: Started Time & Date Service.
Feb 24 17:09:22 raspberrypi systemd-timedated[3830]: Set NTP to disabled
Feb 24 17:09:22 raspberrypi candy-pi-lite: [INFO] USB Serial Ports are found => /dev/QWS.EC25.MODEM, /dev/QWS.EC25.AT
Feb 24 17:09:22 raspberrypi candy-pi-lite: [INFO] New USB serial ports are detected
Feb 24 17:09:22 raspberrypi candy-pi-lite: [INFO] Looking for a Modem Serial port at Barudrate: 115200…
Feb 24 17:09:23 raspberrypi candy-pi-lite: [INFO] Result: /dev/QWS.EC25.MODEM
Feb 24 17:09:23 raspberrypi candy-pi-lite: [INFO] Modem Serial port: /dev/QWS.EC25.MODEM and AT Serial port: /dev/QWS.EC25.AT are selected
Feb 24 17:09:23 raspberrypi candy-pi-lite: [INFO] Initialization Done. Modem Serial Port => /dev/QWS.EC25.MODEM
Feb 24 17:09:25 raspberrypi candy-pi-lite: [INFO] EC25 Phone Functionality => Full
Feb 24 17:09:25 raspberrypi candy-pi-lite: [INFO] Saved APN => mopera.net
Feb 24 17:09:26 raspberrypi candy-pi-lite: [INFO] Operator => N/A
Feb 24 17:09:26 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:09:29 raspberrypi candy-pi-lite: [INFO] Operator => N/A
Feb 24 17:09:29 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:09:31 raspberrypi candy-pi-lite: [INFO] Operator => N/A
Feb 24 17:09:31 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:09:33 raspberrypi candy-pi-lite: [INFO] Operator => JP DOCOMO NTT DOCOMO
Feb 24 17:09:33 raspberrypi candy-pi-lite: [INFO] OK. Registered in the home ps network
Feb 24 17:09:34 raspberrypi candy-pi-lite: [INFO] Module Model: EC25
Feb 24 17:09:34 raspberrypi candy-pi-lite: [INFO] Network Timezone: 9.0
Feb 24 17:09:34 raspberrypi candy-pi-lite: [INFO] Skipped to adjust time
Feb 24 17:09:34 raspberrypi candy-pi-lite: [INFO] Trying to establish a connection…
Feb 24 17:09:34 raspberrypi start_systemd.sh[3689]: RTNETLINK answers: No such process
Feb 24 17:09:34 raspberrypi candy-pi-lite: [INFO] Trying to connect…(Trial:1/3, Timeout:5sec)
Feb 24 17:09:34 raspberrypi candy-pi-lite: [INFO] Starting PPP: /dev/QWS.EC25.MODEM
Feb 24 17:09:34 raspberrypi pppd[3938]: pppd 2.4.7 started by root, uid 0
Feb 24 17:09:36 raspberrypi pppd[3938]: Serial connection established.
Feb 24 17:09:36 raspberrypi pppd[3938]: Using interface ppp0
Feb 24 17:09:36 raspberrypi pppd[3938]: Connect: ppp0 <–> /dev/QWS.EC25.MODEM
Feb 24 17:09:37 raspberrypi pppd[3938]: CHAP authentication succeeded
Feb 24 17:09:37 raspberrypi pppd[3938]: CHAP authentication succeeded
Feb 24 17:09:39 raspberrypi candy-pi-lite: [ERROR] PPP cannot be online
Feb 24 17:09:39 raspberrypi pppd[3938]: Terminating on signal 15
Feb 24 17:09:39 raspberrypi pppd[3938]: Connection terminated.
Feb 24 17:09:40 raspberrypi pppd[3938]: Serial link disconnected.
Feb 24 17:09:41 raspberrypi pppd[3938]: Exit.
Feb 24 17:09:41 raspberrypi candy-pi-lite: [INFO] start_pppd.sh terminated: Exit Code => 5
Feb 24 17:09:41 raspberrypi candy-pi-lite: [INFO] Trying to connect…(Trial:2/3, Timeout:35sec)
Feb 24 17:09:41 raspberrypi candy-pi-lite: [INFO] Starting PPP: /dev/QWS.EC25.MODEM
Feb 24 17:09:41 raspberrypi pppd[4013]: pppd 2.4.7 started by root, uid 0
Feb 24 17:09:43 raspberrypi pppd[4013]: Connect script failed
Feb 24 17:09:44 raspberrypi pppd[4013]: Exit.
Feb 24 17:09:44 raspberrypi candy-pi-lite: [INFO] start_pppd.sh terminated: Exit Code => 8
Feb 24 17:09:44 raspberrypi candy-pi-lite: [ERROR] PPP cannot be online
Feb 24 17:09:44 raspberrypi candy-pi-lite: [INFO] Trying to connect…(Trial:3/3, Timeout:65sec)
Feb 24 17:09:44 raspberrypi candy-pi-lite: [INFO] Starting PPP: /dev/QWS.EC25.MODEM
Feb 24 17:09:44 raspberrypi pppd[4059]: pppd 2.4.7 started by root, uid 0
Feb 24 17:09:46 raspberrypi pppd[4059]: Serial connection established.
Feb 24 17:09:46 raspberrypi pppd[4059]: Using interface ppp0
Feb 24 17:09:46 raspberrypi pppd[4059]: Connect: ppp0 <–> /dev/QWS.EC25.MODEM
Feb 24 17:09:47 raspberrypi pppd[4059]: CHAP authentication succeeded
Feb 24 17:09:47 raspberrypi pppd[4059]: CHAP authentication succeeded
Feb 24 17:09:47 raspberrypi pppd[4059]: Modem hangup
Feb 24 17:09:47 raspberrypi pppd[4059]: Connection terminated.
Feb 24 17:09:48 raspberrypi pppd[4059]: Exit.
Feb 24 17:09:48 raspberrypi candy-pi-lite: [INFO] start_pppd.sh terminated: Exit Code => 16
Feb 24 17:09:49 raspberrypi candy-pi-lite: [ERROR] PPP cannot be online
Feb 24 17:09:49 raspberrypi candy-pi-lite: [WARN] Failed to establishing a connection. Retry after 30 seconds…
Feb 24 17:09:52 raspberrypi systemd[1]: systemd-timedated.service: Succeeded.
Feb 24 17:10:19 raspberrypi kernel: [ 444.631828] usb 1-1.1: USB disconnect, device number 11
Feb 24 17:10:19 raspberrypi kernel: [ 444.632254] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
Feb 24 17:10:19 raspberrypi kernel: [ 444.632311] option 1-1.1:1.0: device disconnected
Feb 24 17:10:19 raspberrypi kernel: [ 444.632725] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
Feb 24 17:10:19 raspberrypi kernel: [ 444.632784] option 1-1.1:1.1: device disconnected
Feb 24 17:10:19 raspberrypi kernel: [ 444.633188] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
Feb 24 17:10:19 raspberrypi kernel: [ 444.633257] option 1-1.1:1.2: device disconnected
Feb 24 17:10:19 raspberrypi kernel: [ 444.633801] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
Feb 24 17:10:19 raspberrypi kernel: [ 444.633916] option 1-1.1:1.3: device disconnected
Feb 24 17:10:19 raspberrypi kernel: [ 444.634141] qmi_wwan 1-1.1:1.4 wwan0: unregister ‘qmi_wwan’ usb-0000:01:00.0-1.1, WWAN/QMI device
Feb 24 17:10:20 raspberrypi candy-pi-lite: [ERROR] The path [/dev/QWS.EC25.MODEM] is missing
Feb 24 17:10:20 raspberrypi candy-pi-lite: [ERROR] The path [/dev/QWS.EC25.MODEM] is missing
Feb 24 17:10:20 raspberrypi candy-pi-lite: [ERROR] No serialport is available, will restart after 10 seconds
Feb 24 17:10:30 raspberrypi systemd[1]: candy-pi-lite.service: Main process exited, code=exited, status=5/NOTINSTALLED
Feb 24 17:10:30 raspberrypi systemd[1]: candy-pi-lite.service: Failed with result ‘exit-code’.
Feb 24 17:10:30 raspberrypi systemd[1]: candy-pi-lite.service: Service RestartSec=100ms expired, scheduling restart.
Feb 24 17:10:30 raspberrypi systemd[1]: candy-pi-lite.service: Scheduled restart job, restart counter is at 2.
Feb 24 17:10:30 raspberrypi systemd[1]: Stopped CANDY Pi Lite Service, version:10.2.1.
Feb 24 17:10:30 raspberrypi systemd[1]: Started CANDY Pi Lite Service, version:10.2.1.
Feb 24 17:10:30 raspberrypi candy-pi-lite: [INFO] Initializing CANDY Pi Lite Board…
Feb 24 17:10:31 raspberrypi candy-pi-lite: [INFO] Looking for a Modem Serial port at Barudrate: 115200…
Feb 24 17:10:32 raspberrypi candy-pi-lite: [INFO] Result: None
Feb 24 17:10:32 raspberrypi candy-pi-lite: [INFO] Looking for a Modem Serial port at Barudrate: 460800…
Feb 24 17:10:33 raspberrypi candy-pi-lite: [INFO] Result: None
Feb 24 17:10:33 raspberrypi candy-pi-lite: [INFO] Looking for a Modem Serial port at Barudrate: 115200…
Feb 24 17:10:34 raspberrypi candy-pi-lite: [INFO] Result: None
Feb 24 17:10:34 raspberrypi candy-pi-lite: [INFO] Looking for a Modem Serial port at Barudrate: 460800…
Feb 24 17:10:35 raspberrypi candy-pi-lite: [INFO] Result: None
Feb 24 17:10:36 raspberrypi candy-pi-lite: [INFO] Looking for a Modem Serial port at Barudrate: 115200…
Feb 24 17:10:37 raspberrypi candy-pi-lite: [INFO] Result: None
Feb 24 17:10:37 raspberrypi candy-pi-lite: [INFO] Looking for a Modem Serial port at Barudrate: 460800…
Feb 24 17:10:38 raspberrypi candy-pi-lite: [INFO] Result: None
Feb 24 17:10:39 raspberrypi candy-pi-lite: [INFO] Looking for a Modem Serial port at Barudrate: 115200…
Feb 24 17:10:40 raspberrypi candy-pi-lite: [INFO] Result: None
Feb 24 17:10:40 raspberrypi candy-pi-lite: [INFO] Looking for a Modem Serial port at Barudrate: 460800…
Feb 24 17:10:41 raspberrypi candy-pi-lite: [INFO] Result: None
Feb 24 17:10:42 raspberrypi candy-pi-lite: [INFO] Looking for a Modem Serial port at Barudrate: 115200…
Feb 24 17:10:42 raspberrypi candy-pi-lite: [INFO] Result: /dev/ttySC1
Feb 24 17:10:42 raspberrypi candy-pi-lite: [INFO] Modem Serial port: /dev/ttySC1 and AT Serial port: /dev/ttySC1 are selected
Feb 24 17:10:43 raspberrypi candy-pi-lite: [INFO] Initializing modem with baudrate:460800
Feb 24 17:10:44 raspberrypi candy-pi-lite: [INFO] Modem baudrate changed: 115200 => 460800
Feb 24 17:10:44 raspberrypi candy-pi-lite: [INFO] Initialization Done. Modem Serial Port => /dev/ttySC1 Modem baudrate => 460800
Feb 24 17:10:44 raspberrypi kernel: [ 469.503908] usb 1-1.1: new high-speed USB device number 12 using xhci_hcd
Feb 24 17:10:44 raspberrypi kernel: [ 469.644026] usb 1-1.1: New USB device found, idVendor=2c7c, idProduct=0125, bcdDevice= 3.18
Feb 24 17:10:44 raspberrypi kernel: [ 469.644036] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Feb 24 17:10:44 raspberrypi kernel: [ 469.644044] usb 1-1.1: Product: Android
Feb 24 17:10:44 raspberrypi kernel: [ 469.644051] usb 1-1.1: Manufacturer: Android
Feb 24 17:10:44 raspberrypi kernel: [ 469.653337] option 1-1.1:1.0: GSM modem (1-port) converter detected
Feb 24 17:10:44 raspberrypi kernel: [ 469.653516] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0
Feb 24 17:10:44 raspberrypi kernel: [ 469.653747] option 1-1.1:1.1: GSM modem (1-port) converter detected
Feb 24 17:10:44 raspberrypi kernel: [ 469.653941] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1
Feb 24 17:10:44 raspberrypi kernel: [ 469.654202] option 1-1.1:1.2: GSM modem (1-port) converter detected
Feb 24 17:10:44 raspberrypi kernel: [ 469.654376] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2
Feb 24 17:10:44 raspberrypi kernel: [ 469.654626] option 1-1.1:1.3: GSM modem (1-port) converter detected
Feb 24 17:10:44 raspberrypi kernel: [ 469.654783] usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB3
Feb 24 17:10:44 raspberrypi kernel: [ 469.656111] qmi_wwan 1-1.1:1.4: cdc-wdm0: USB WDM device
Feb 24 17:10:44 raspberrypi kernel: [ 469.657317] qmi_wwan 1-1.1:1.4 wwan0: register ‘qmi_wwan’ at usb-0000:01:00.0-1.1, WWAN/QMI device, 2a:bb:7d:f1:82:6a
Feb 24 17:10:44 raspberrypi mtp-probe: checking bus 1, device 12: “/sys/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1”
Feb 24 17:10:44 raspberrypi mtp-probe: bus: 1, device: 12 was not an MTP device
Feb 24 17:10:44 raspberrypi systemd-udevd[4288]: Using default interface naming scheme ‘v240’.
Feb 24 17:10:44 raspberrypi mtp-probe: checking bus 1, device 12: “/sys/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1”
Feb 24 17:10:44 raspberrypi mtp-probe: bus: 1, device: 12 was not an MTP device
Feb 24 17:10:45 raspberrypi candy-pi-lite: [INFO] SIM card state => SIM_STATE_READY
Feb 24 17:10:45 raspberrypi dbus-daemon[524]: [system] Activating via systemd: service name=‘org.freedesktop.timedate1’ unit=‘dbus-org.freedesktop.timedate1.service’ requested by ‘:1.42’ (uid=0 pid=4309 comm="timedatectl set-ntp false ")
Feb 24 17:10:45 raspberrypi systemd[1]: Starting Time & Date Service…
Feb 24 17:10:45 raspberrypi dbus-daemon[524]: [system] Successfully activated service ‘org.freedesktop.timedate1’
Feb 24 17:10:45 raspberrypi systemd[1]: Started Time & Date Service.
Feb 24 17:10:45 raspberrypi systemd-timedated[4310]: Set NTP to disabled
Feb 24 17:10:45 raspberrypi candy-pi-lite: [INFO] USB Serial Ports are found => /dev/QWS.EC25.MODEM, /dev/QWS.EC25.AT
Feb 24 17:10:45 raspberrypi candy-pi-lite: [INFO] New USB serial ports are detected
Feb 24 17:10:45 raspberrypi candy-pi-lite: [INFO] Looking for a Modem Serial port at Barudrate: 115200…
Feb 24 17:10:45 raspberrypi candy-pi-lite: [INFO] Result: /dev/QWS.EC25.MODEM
Feb 24 17:10:45 raspberrypi candy-pi-lite: [INFO] Modem Serial port: /dev/QWS.EC25.MODEM and AT Serial port: /dev/QWS.EC25.AT are selected
Feb 24 17:10:45 raspberrypi candy-pi-lite: [INFO] Initialization Done. Modem Serial Port => /dev/QWS.EC25.MODEM
Feb 24 17:10:47 raspberrypi candy-pi-lite: [INFO] EC25 Phone Functionality => Full
Feb 24 17:10:48 raspberrypi candy-pi-lite: [INFO] Saved APN => mopera.net
Feb 24 17:10:49 raspberrypi candy-pi-lite: [INFO] Operator => N/A
Feb 24 17:10:49 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:10:51 raspberrypi candy-pi-lite: [INFO] Operator => N/A
Feb 24 17:10:51 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:10:53 raspberrypi candy-pi-lite: [INFO] Operator => N/A
Feb 24 17:10:53 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:10:55 raspberrypi candy-pi-lite: [INFO] Operator => N/A
Feb 24 17:10:55 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:10:58 raspberrypi candy-pi-lite: [INFO] Operator => N/A
Feb 24 17:10:58 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:11:00 raspberrypi candy-pi-lite: [INFO] Operator => JP DOCOMO NTT DOCOMO
Feb 24 17:11:00 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:11:02 raspberrypi candy-pi-lite: [INFO] Operator => JP DOCOMO NTT DOCOMO
Feb 24 17:11:02 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:11:04 raspberrypi candy-pi-lite: [INFO] Operator => JP DOCOMO NTT DOCOMO
Feb 24 17:11:04 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:11:06 raspberrypi candy-pi-lite: [INFO] Operator => JP DOCOMO NTT DOCOMO
Feb 24 17:11:06 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:11:08 raspberrypi candy-pi-lite: [INFO] Operator => JP DOCOMO NTT DOCOMO
Feb 24 17:11:09 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:11:11 raspberrypi candy-pi-lite: [INFO] Operator => JP DOCOMO NTT DOCOMO
Feb 24 17:11:11 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:11:13 raspberrypi candy-pi-lite: [INFO] Operator => JP DOCOMO NTT DOCOMO
Feb 24 17:11:13 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:11:15 raspberrypi systemd[1]: systemd-timedated.service: Succeeded.
Feb 24 17:11:15 raspberrypi candy-pi-lite: [INFO] Operator => JP DOCOMO NTT DOCOMO
Feb 24 17:11:15 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:11:17 raspberrypi candy-pi-lite: [INFO] Operator => JP DOCOMO NTT DOCOMO
Feb 24 17:11:17 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:11:20 raspberrypi candy-pi-lite: [INFO] Operator => JP DOCOMO NTT DOCOMO
Feb 24 17:11:20 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:11:22 raspberrypi candy-pi-lite: [INFO] Operator => JP DOCOMO NTT DOCOMO
Feb 24 17:11:22 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:11:24 raspberrypi candy-pi-lite: [INFO] Operator => JP DOCOMO NTT DOCOMO
Feb 24 17:11:24 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:11:26 raspberrypi candy-pi-lite: [INFO] Operator => JP DOCOMO NTT DOCOMO
Feb 24 17:11:26 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:11:28 raspberrypi candy-pi-lite: [INFO] Operator => JP DOCOMO NTT DOCOMO
Feb 24 17:11:28 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:11:31 raspberrypi candy-pi-lite: [INFO] Operator => JP DOCOMO NTT DOCOMO
Feb 24 17:11:31 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:11:33 raspberrypi candy-pi-lite: [INFO] Operator => JP DOCOMO NTT DOCOMO
Feb 24 17:11:33 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:11:35 raspberrypi candy-pi-lite: [INFO] Operator => JP DOCOMO NTT DOCOMO
Feb 24 17:11:35 raspberrypi candy-pi-lite: [INFO] Waiting for network registration => Status:Searching
Feb 24 17:11:37 raspberrypi candy-pi-lite: [INFO] Operator => NTT DOCOMO NTT DOCOMO
Feb 24 17:11:37 raspberrypi candy-pi-lite: [INFO] OK. Registered in the home ps network
Feb 24 17:11:38 raspberrypi candy-pi-lite: [INFO] Module Model: EC25
Feb 24 17:11:38 raspberrypi candy-pi-lite: [INFO] Network Timezone: 9.0
Feb 24 17:11:38 raspberrypi candy-pi-lite: [INFO] Skipped to adjust time
Feb 24 17:11:38 raspberrypi candy-pi-lite: [INFO] Trying to establish a connection…
Feb 24 17:11:38 raspberrypi start_systemd.sh[4169]: RTNETLINK answers: No such process
Feb 24 17:11:38 raspberrypi candy-pi-lite: [INFO] Trying to connect…(Trial:1/3, Timeout:5sec)
Feb 24 17:11:38 raspberrypi candy-pi-lite: [INFO] Starting PPP: /dev/QWS.EC25.MODEM
Feb 24 17:11:38 raspberrypi pppd[4835]: pppd 2.4.7 started by root, uid 0
Feb 24 17:11:40 raspberrypi pppd[4835]: Serial connection established.
Feb 24 17:11:40 raspberrypi pppd[4835]: Using interface ppp0
Feb 24 17:11:40 raspberrypi pppd[4835]: Connect: ppp0 <–> /dev/QWS.EC25.MODEM
Feb 24 17:11:41 raspberrypi pppd[4835]: CHAP authentication succeeded
Feb 24 17:11:41 raspberrypi pppd[4835]: CHAP authentication succeeded
Feb 24 17:11:41 raspberrypi pppd[4835]: Modem hangup
Feb 24 17:11:41 raspberrypi pppd[4835]: Connection terminated.
Feb 24 17:11:42 raspberrypi pppd[4835]: Exit.
Feb 24 17:11:42 raspberrypi candy-pi-lite: [INFO] start_pppd.sh terminated: Exit Code => 16
Feb 24 17:11:42 raspberrypi candy-pi-lite: [ERROR] PPP cannot be online
Feb 24 17:11:42 raspberrypi candy-pi-lite: [INFO] Trying to connect…(Trial:2/3, Timeout:35sec)
Feb 24 17:11:42 raspberrypi candy-pi-lite: [INFO] Starting PPP: /dev/QWS.EC25.MODEM
Feb 24 17:11:43 raspberrypi pppd[4892]: pppd 2.4.7 started by root, uid 0
Feb 24 17:11:44 raspberrypi pppd[4892]: Serial connection established.
Feb 24 17:11:44 raspberrypi pppd[4892]: Using interface ppp0
Feb 24 17:11:44 raspberrypi pppd[4892]: Connect: ppp0 <–> /dev/QWS.EC25.MODEM
Feb 24 17:11:45 raspberrypi pppd[4892]: CHAP authentication succeeded
Feb 24 17:11:45 raspberrypi pppd[4892]: CHAP authentication succeeded
Feb 24 17:11:45 raspberrypi pppd[4892]: Could not determine remote IP address: defaulting to 10.64.64.64
Feb 24 17:11:45 raspberrypi pppd[4892]: local IP address 146.160.186.3
Feb 24 17:11:45 raspberrypi pppd[4892]: remote IP address 10.64.64.64
Feb 24 17:11:45 raspberrypi pppd[4892]: primary DNS address 220.159.212.200
Feb 24 17:11:45 raspberrypi pppd[4892]: secondary DNS address 220.159.212.201
Feb 24 17:11:46 raspberrypi candy-pi-lite: [INFO] PPP goes online
Feb 24 17:11:46 raspberrypi candy-pi-lite: [INFO] CANDY Pi Lite Board is initialized successfully!
Feb 24 17:11:46 raspberrypi candy-pi-lite: server_main.: [NOTICE] serial_port:/dev/QWS.EC25.AT (460800 bps), nic:ppp0
Feb 24 17:11:46 raspberrypi candy-pi-lite: server_main.init: [NOTICE] RESTART_SCHEDULE_CRON=>[] is ignored
Feb 24 17:11:46 raspberrypi candy-pi-lite: server_main.run: [NOTICE] Button Extension is terminated.

ご質問ありがとうございます。
version:10.2.1のCANDY Pi Lite Serviceを使用していて、これまで10分ほど接続にかかっていたものが2/25だけ2分程度で接続したということでどんな原因が考えられるかということでしょうか。

CANDY Pi Lite Serviceのバージョンが同じで、かつ場所も同じところで動作させているのであれば、考えられるのは周囲の電波環境の変化と推測されます。
基地局の増加か、周囲の電波利用状況の変化などによるものではないでしょうか。

ログを拝見する限り、PPPの確立の失敗が連続して繰り返されていたり、ネットワークへの登録に時間がかかっているようです。これらが発生しがちな状況を考えますと、電波を掴みにくい、干渉・混雑している、あるいは感度が弱いなどの電波環境によるものではないかと推測しております。