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Modem 5 minutes not connected after receiving a call

I saw an incoming call of an unknown number which hang up before I could pick up the phone, so no phone call connection was established.

Immediately after this, I saw an exclamation mark in the mobile connection icon in the status bar.

I left the phone further untouched (I only ssh-ed in to see the logging). After 5 minutes, the modem was connected again and the exclamation mark disappeared.

This is the log from receiving the call until having a connection again:exclamation_mark_after_call_and_resolving_later.log

This is the result of cat exclamation_mark_after_call_and_resolving_later.log | grep -i "state changed,"

Jan 05 17:26:32 avalon NetworkManager[609]: <info>  [1672935992.1769] modem["cdc-wdm0"]: modem state changed, 'connected' --> 'registered' (reason: user-requested)
Jan 05 17:26:32 avalon NetworkManager[609]: <info>  [1672935992.2981] modem["cdc-wdm0"]: modem state changed, 'registered' --> 'connecting' (reason: user-requested)
Jan 05 17:26:33 avalon NetworkManager[609]: <info>  [1672935993.4681] modem["cdc-wdm0"]: modem state changed, 'connecting' --> 'registered' (reason: user-requested)
Jan 05 17:26:33 avalon NetworkManager[609]: <info>  [1672935993.4986] modem["cdc-wdm0"]: modem state changed, 'registered' --> 'connecting' (reason: user-requested)
Jan 05 17:26:33 avalon NetworkManager[609]: <info>  [1672935993.5236] modem["cdc-wdm0"]: modem state changed, 'connecting' --> 'registered' (reason: user-requested)
Jan 05 17:26:33 avalon NetworkManager[609]: <info>  [1672935993.5427] modem["cdc-wdm0"]: modem state changed, 'registered' --> 'connecting' (reason: user-requested)
Jan 05 17:26:33 avalon NetworkManager[609]: <info>  [1672935993.5628] modem["cdc-wdm0"]: modem state changed, 'connecting' --> 'registered' (reason: user-requested)
Jan 05 17:26:33 avalon NetworkManager[609]: <info>  [1672935993.6370] modem["cdc-wdm0"]: modem state changed, 'registered' --> 'connecting' (reason: user-requested)
Jan 05 17:26:33 avalon NetworkManager[609]: <info>  [1672935993.6809] modem["cdc-wdm0"]: modem state changed, 'connecting' --> 'registered' (reason: user-requested)
Jan 05 17:26:33 avalon NetworkManager[609]: <info>  [1672935993.7031] modem["cdc-wdm0"]: modem state changed, 'registered' --> 'connecting' (reason: user-requested)
Jan 05 17:26:33 avalon NetworkManager[609]: <info>  [1672935993.7167] modem["cdc-wdm0"]: modem state changed, 'connecting' --> 'registered' (reason: user-requested)
Jan 05 17:26:33 avalon NetworkManager[609]: <info>  [1672935993.7363] modem["cdc-wdm0"]: modem state changed, 'registered' --> 'connecting' (reason: user-requested)
Jan 05 17:26:33 avalon NetworkManager[609]: <info>  [1672935993.7521] modem["cdc-wdm0"]: modem state changed, 'connecting' --> 'registered' (reason: user-requested)
Jan 05 17:26:33 avalon NetworkManager[609]: <info>  [1672935993.8262] modem["cdc-wdm0"]: modem state changed, 'registered' --> 'connecting' (reason: user-requested)
Jan 05 17:26:33 avalon NetworkManager[609]: <info>  [1672935993.8699] modem["cdc-wdm0"]: modem state changed, 'connecting' --> 'registered' (reason: user-requested)
Jan 05 17:26:33 avalon NetworkManager[609]: <info>  [1672935993.8868] modem["cdc-wdm0"]: modem state changed, 'registered' --> 'connecting' (reason: user-requested)
Jan 05 17:26:33 avalon NetworkManager[609]: <info>  [1672935993.9100] modem["cdc-wdm0"]: modem state changed, 'connecting' --> 'registered' (reason: user-requested)
Jan 05 17:26:33 avalon NetworkManager[609]: <info>  [1672935993.9303] modem["cdc-wdm0"]: modem state changed, 'registered' --> 'connecting' (reason: user-requested)
Jan 05 17:26:33 avalon NetworkManager[609]: <info>  [1672935993.9504] modem["cdc-wdm0"]: modem state changed, 'connecting' --> 'registered' (reason: user-requested)
Jan 05 17:31:33 avalon NetworkManager[609]: <info>  [1672936293.9968] modem["cdc-wdm0"]: modem state changed, 'registered' --> 'connecting' (reason: user-requested)
Jan 05 17:31:34 avalon NetworkManager[609]: <info>  [1672936294.9901] modem["cdc-wdm0"]: modem state changed, 'connecting' --> 'connected' (reason: user-requested)