Another strange behaviour

[WinePrince]

Mine didn't tumble upside down like that. But the "fluttering" sounds like a good description of the whole episode. I've rebuilt everything basically transplanting the electronics into a new shell, new 3D gimbal, new Gopro, new landing legs. I've had one low test flight and did not seen the behaviour. The weather has been rainy so not much opportunity to do more than the one test since rebuilding. Will post once I've done more test flights.