Yikes.. the same sort of thing just started happening to my 650.. I've had it since last November and it was working great until a few days ago. Suddenly it randomly asks me if "I'm sure I want to turn the device completely off" while I'm reading a book and randomly flickers between sleep mode and being awake. Annoyingly, two out of the last three days it must have woken itself up from sleep mode while I was at work because I've come home to a dead battery..
Sucks to hear that Sony's repair service is so lame.. now I'm dreading dealing with this. I've had two other companies send me back my defective product unrepaired with a claim that it was "fine" (ASUS and Fujifilm) when it obviously wasn't working in any real life situation, and there's nothing more aggravating... All that means is not only do they have an awful repair service but they must also have an awful QA/test process. no wonder it has problems in the first place..
