I got an 8820 from T-Mobile 13 days ago. It seemed fine until yesterday or day before. Then it started dropping calls and sustaining a lame connection at best. T-Mobile tech support had me wipe the device, which left it in worse shape--now it won't even dial. At least I don't have my mother-in-law's phone number in my pocket for the moment. Is there a widespread problem with T-Mobile's 8820?