Today my copter crashed after some fpw flying while parked in loiter mode (10/15m alt). It started to fly circles (aprox 5m diameter) and suddently picked up speed and circled down...
Luckely there was no damage because I managed to slow it down and level the copter before impact.
I checked the logs of the flight, and there sems to be kind of oscillating in the roll_in / roll and also in pitch_in / pitch values... easy to find, just graph this values and the baro_alt.
As I said, I had parked the copter and was checking the screen, the radio out of reach.
Has anybody an idea what caused this circle inputs? Would be very greatful for any suggestions or solutions!
copter is a a 650mm quad with HD3542 motors, 13x4 blades, with equipment aprox 2.8kg.