My mavic pro has recently started rotating usually clockwise, very slowly but noticeable. E.g. if i centre on a lamp post and put control down, wind 3-3mph perfect day. The drone will rotate over time, a good cm on the screen in a couple of minutes. This is amplified when flying fwd or bkwd ruining any footage. I've tried calibrating the IMU, remote, compass, on many occasions, I've changed batteries props ect all to no effect. I've formatted and reinstalled firmware on all devices, drone and controll but it's still happening... I'm getting no warnings and the unit has had no crashes or hard knocks whatsoever, it's 3 only 3 months old, had 25 flights. Am I missing something or is it a case for DJI? TIA