Haven't downloaded a different camera app or anything, but when taking about every third or fourth photo my screen freezes up. And I mean over 20 seconds of wait time. The photo is there, but the phone isn't doing anything. I pressed menu, back, etc, and no response. Finally after pressing the top unlock button the phone wakes back up and loses the picture. Anyone else experiencing this? My SD card is a class 6 - so shouldn't be having problems writing to it, correct?