Hello I wonder if any of you could help diagnose my Visions behavior. It has literally decided to give me virtually no height control, it will let me take off, a minute or two of hovering and it is up and down like a whores drawers! Usually down and no amount of opposite stick will arrest its decent, this of course results in a crash every flight, it also seems virtually incapable of holding its position without input from me. It is completely up to date, calibrated etc with at least 7 satellites. It's killing me please help.