Nokia 6682 / 6681

Hey everyone..having this strange issue where the cam turns on and off on its own...sometimes it just stays on in standby mode....and kills the battery. If it does turn itself off, it returns to the main screen and the keys are now unlocked. This is EXTREMELY annoying. Happens more so while texting...so you get 2 chars. in and it fires the cam up...hit exit continue typing then BAM again.....at my wits end. Then it'll be fine for weeks on end then one day.....
Any help appreciated...