Hello! me is exactly the same, but nailed. I do not know how to fix it. Someone who can tell us something about this? the same is the proximity sensor do not know. But it is supposed to when you would get close to the face the screen turns black, and when you're away is reactivated, but it happens, like you, once I hang up, but it is not put in black when I get closer is all the time looking, and again if I ever call directly goes black and I can not hang, and so forth, as if it were a loop.