Hi All, my Second post! Bumping this into here because no-one seemed to be looking at the Phantom Help forum Bought a second hand Phantom vision, needed a motor replacing which I've done. I've had a couple of good flights then I was flying on my local beach this morning when after about 5 mins while hovering ok she suddenly started yawing left, not fast, about 1 revolution in 10 seconds, I managed to land and shut down the motors, restarted them and it was the same so landed and powered off the phantom, powered on again and she was ok agaon for another 5 mins where it all started again. I saw this once before, but after that she flew through a whole battery with no issues. I've done the advanced cal in the assistant software and calibrated the compass on the beach before flying. Any ideas? Thanks!!