That is weird.
Could you try
- booting your phone
- waiting a bit
- putting to phone into flight mode
- waiting a bit
- start to collect logs (normal and radio buffers in D, please)
- disable flight mode so that you should be roaming
- removing any personal information
- posting it here?
(The logging commands should be something like
$ adb logcat -b radio \*:D >> $(date -I).radio.log &
$ adb logcat \*:D >> $(date -I).normal.log &
I wanted to link this tutorial, but sadly it’s not there, yet.)