idk what happened to mine cuz i my bro was using and out no where it was a mark in the screen( from like inside) and the sleep button doesnt work !! its very frustrating.. idk what to do. like my brother said tht he had it in his pocket but i dun think that a pocket could damage the screen and The SLEEP button but i dun care about the screen but the sleep bottom everything work perfectly but the sleep button doesn't.