I tried to post a picture of the UI widget that triggered the problem but I don't think that feature is working here. So here is a verbal:
Near the top of the page on the right is a greater-than sign (">" white background, blue text). Below the greater-than sign is a gear icon but I did not click on that.
When you click on the greater-than sign, it slides out a panel with three icons: WiFi, RMS, and Mobile. Right now, while the unit is still in the broken state, only the Mobile icon shows as blue and the other two are grayed out. A spinner has been spinning for 10 minutes below the icons. I believe it is spinning because it cannot access the Mobile modem because it is wedged. (On other units a status widget displays instead of the spinner.) No messages have appeared in the logread log since I opened the widget.
Regarding the modem reset, it did not help. Below are log messages from a time when it got interesting. Until it logged that it cancelled the request, the web interface was 100% non-responsive.
Thu Nov 10 15:07:20 2022 daemon.info unhandler[3425]: modem_init[1-1.4][12]: reboot
Thu Nov 10 15:07:20 2022 daemon.info unhandler[3425]: modem_init[12]: modem reboot not needed.
Thu Nov 10 15:07:20 2022 daemon.info unhandler[3425]: modem_init[1-1.4][13]: AT+QCSQ=1
... (redacted due to maximum character count restriction)
Thu Nov 10 15:07:21 2022 daemon.info unhandler[3425]: Exiting modem init...
Thu Nov 10 15:07:21 2022 daemon.info unhandler[3425]: *Unsolicited id: 1-1.4 | msg: '+QIND: PB DONE'
Thu Nov 10 15:07:21 2022 daemon.info unhandler[3425]: Attempt to retrieve IMSI number...
Thu Nov 10 15:07:21 2022 daemon.info unhandler[3425]: IMSI: 310030001701104
Thu Nov 10 15:07:21 2022 daemon.info unhandler[3425]:
Thu Nov 10 15:07:21 2022 daemon.info unhandler[3425]: Checking module revision...
Thu Nov 10 15:07:22 2022 daemon.info unhandler[3425]: Module revision: EC25AFFDR07A09M4G
Thu Nov 10 15:07:22 2022 daemon.info unhandler[3425]: [oper_subsys_init:97] error: Don't get option "operlist" from config
Thu Nov 10 15:07:22 2022 daemon.info unhandler[3425]: active_sim: |1|
Thu Nov 10 15:07:22 2022 daemon.info unhandler[3425]: pdp: |1|
Thu Nov 10 15:07:22 2022 daemon.info unhandler[3425]: pdp_type: |1|
Thu Nov 10 15:07:22 2022 daemon.info unhandler[3425]: auto_apn: |1|
Thu Nov 10 15:07:22 2022 daemon.info unhandler[3425]: force_apn: |0|
Thu Nov 10 15:07:22 2022 daemon.info unhandler[3425]: mcc: |310|
Thu Nov 10 15:07:22 2022 daemon.info unhandler[3425]: mnc: |030|
Thu Nov 10 15:07:22 2022 daemon.info unhandler[3425]: volte: |0|
Thu Nov 10 15:07:22 2022 daemon.info unhandler[3425]: service_mode:|1|
Thu Nov 10 15:07:22 2022 daemon.info unhandler[3425]: Attempt to fetch APN list...
Thu Nov 10 15:07:22 2022 daemon.info unhandler[3425]: Getting APN list from database
Thu Nov 10 15:07:22 2022 daemon.info unhandler[3425]: APN Fetch is done.
Thu Nov 10 15:07:22 2022 daemon.info unhandler[3425]: gsm send: AT+CFUN?
Thu Nov 10 15:07:22 2022 daemon.info unhandler[3425]: gsm get: `+CFUN: 1`
Thu Nov 10 15:07:24 2022 daemon.info unhandler[3425]: gsm send: AT+COPS?
Thu Nov 10 15:07:24 2022 daemon.info unhandler[3425]: gsm get: `+COPS: 1`
Thu Nov 10 15:07:24 2022 daemon.info unhandler[3425]: Connecting to: 310410
Thu Nov 10 15:09:29 2022 kern.notice kernel: widget configuration has been changed
Thu Nov 10 15:09:36 2022 kern.notice kernel: widget configuration has been changed
Thu Nov 10 15:09:36 2022 kern.notice kernel: overview configuration has been changed
Thu Nov 10 15:09:37 2022 kern.notice kernel: overview configuration has been changed
Thu Nov 10 15:09:37 2022 kern.notice kernel: overview configuration has been changed
Thu Nov 10 15:09:37 2022 kern.notice kernel: overview configuration has been changed
Thu Nov 10 15:10:24 2022 daemon.info unhandler[3425]: [operctl_force_connect_to_operator:658] error: Failed to connect to operator! ERROR: ||
Thu Nov 10 15:10:24 2022 daemon.info unhandler[3425]: gsm send: AT+COPS?
Thu Nov 10 15:10:54 2022 daemon.info unhandler[3425]: gsm get some kind of error
Thu Nov 10 15:10:54 2022 daemon.info unhandler[3425]: gsm send: AT+COPS=2
Thu Nov 10 15:13:54 2022 daemon.info unhandler[3425]: gsm get some kind of error
Thu Nov 10 15:13:54 2022 daemon.info unhandler[3425]: OPERCTL_ERROR_AT_EXEC_FAIL
Thu Nov 10 15:13:54 2022 daemon.info unhandler[3425]: Job done. Failed to execute some AT commands.
Thu Nov 10 15:15:45 2022 daemon.info gsmd[5011]: gsmd[dispatch_queue_work():900]: Modem 1-1.4 is not responding for over 500 seconds. Current request is cancelled.