My Phantom 2 went nuts this afternoon and flew away and crashed into a lake unrecoverable. Bummed to say the least. Has this happened to anyone else and do you know why? This is my second Phantom I got to upgrade to FPV. Lost the quad, Gopro, and FPV transmitter. Would be alright with it if it was pilot error, but not the case. Was my second flight of the afternoon and as I was trying to retain control it came back toward me only to veer off and fly away. Tried failsafe return mode as it veered off and got no response despite a confirmed home lock before take off. Any ideas?