Two bugs in my Lumia 920.
I have had 6 reboots in five days. First day nothing, then friday 4, then two days nothing and today 2 times in a row. No apps, nothing was used in phone. Just when you grab the phone there is request to input sim code. But this is already in bug list so its okay.
This one isn't. Somehow cellular connection goes down. This has happened twice. Funny thing is that front screen shows that everything is okay. It gives full bars, it shows 3G and also carrier name is there showing that phone is connected. Solution was to switch phone to offline and back. Then everything worked well. Only thing to notice this is that when sending sms, phones gives error "cant send, please try again". If you try to call someone, there is just silence in your phone.