About three times in the last week my phone suddenly starts to ring. When I get the phone out the screen is blank (i.e. dark as in stand-by mode). And no matter what i do (i.e. touch where the answer should be, or push the home button) it doesnt shut up. The phone keeps ringing until I re-boot the phone (i.e. hold down the home and power button for a few seconds.) my firm-ware is 2.30.03. Anyone else have this problem?