Problems with phone calls and text messages

[gefri]

Perhaps have a look at our discussion here:

Incoming phone calls not received

FP5 with 3.4-a15-20260114569178-official-FP5 Since the OTA upgrade A13->A15 I have recurrently the situation, that incoming calls are not received by the phone. The caller is immediately dropped as if my phone were offline, which is not the case. Instead I instantly receive an SMS from the provider about a ‘missed call’. Rebooting the phone resolves this issue for a while, i.e. receiving calls as usual. Any ideas about possible cause and solutions are appreciated. Thank you