I just had a weird one. The camera seemed OK on startup but would die after a few seconds. The screen would stay black and there were odd indications about weak signal - although I was 1 metre away and the signal seemed fine. The P3 would fly ok (blind). I did everything I could think of and nothing helped .... until I took out the SD card. Simply taking the card out fixed it. There was nothing on the card - I'll reformat it and see how it goes later. Talked to my dealer and he's heard of a few doing this. If the Phantom doesn't read or doesn't like the SD card on startup, it switches the camera off. A good reason to have a spare card or two in your bag - as well as for those times you leave the card in the computer.