When I am on a call on my week old 32gig 3Gs the screen goes dead. For instance, if I need to look up a number, or even end a call, when I take my face away from the screen it lights up like it should, but only for about half a second. It then becomes black and unresponsive for anywhere from 5 to 30 seconds. Has anybody dealt with anything like this before or have any idea how to fix this. Its a major hassle to take 30 seconds just to hang up the phone. Thanks in advance