Ok, I've searched the threads but can't believe noone has had this problem before me:
I've had this 650 for about 4 months and the only problem was at the beginning with the loose SIM card in thin tray problem. That was solved way back when and it's been a beautiful relationship for 4 months.

But now I am getting a wierd situation where pressing the shutdown button briefly to shut off the palm without shutting down the phone refuses to turn off the PDA. Hard and soft resets will correct it, as well as clicking between different apps like the email button, then the schedule button, then the home button. Sometimes the off button then works, sometimes not. Taking the battery out and replacing it will work, but the problem comes back.

I haven't upgraded the operating sys, nor installed any new apps when this started so I'm clueless. Anyone have any thoughts / similar experiences and solutions?