BB Bold 9700 :: In Middle Of A Call Hear Nothing / Phone Locked Up / Hone Reboots

Im trying to figure out if i should just return this phone, this is my second bold, "auto focus problem was other problem". I've had this phone for around three months, three or four times it has happened, i will be in the middle of a call and i will hear nothing, i look at the phone and its locked up, then solid red light, then phone reboots. Phone works fine for three or four weeks. i never had this problem with my curve 8320. I think its a app that might be auto updating on its own but wanted to see if anyone else is having same problem.