Just had my first scare with the quad copter. Went out to the end of a road out in the open in the middle of nowhere and flew it. My wife wanted me to get a shot flying down in to the lower valley. So I launched it, and as I was descending in to the valley the compass went wonky causing the copter to go into another mode P-Opti which was fine but all of a sudden the copter was flying forward on its own like someone else was flying it. I was freaking thinking its gonna fly away on me. Finally I was able to get it back and land it safe. I tried calibrating the compass which was fine, then went to try and fly again but the compass error popped up again, possibly a magnetic field anomaly? The only metal close by was the car that was 30 feet away, gravel and tundra is the only thing in the area. Honestly thought this was a fly away. Anyone else have this happen?