Hello, I think i'm experiencing a bug.
I'm currently on 3.1 and it's running pretty well, but in last 48 it happened 4 times that my phone couldn't call/recieve calls. The signal icons was stuck at 1 or 2 or 3 bars without moving, like it was frozen. I had to restart the phone to be able to call someone/recieve call/sms.
It never happened before. i didnt change anything in settings in last weeks, i do not perform undervolt, i do not use extweaks profiles.
It's very weird that is modem, i've always used it since i switched to ICS and i never had a problem. Currently on sammy LP3.