Today I was flying my copter (GAUI 330/APM1/v.2.5.5 from MP) and suddenly it made a very strange flip/roll. Luckily I had some height and the copter stabilised after e few seconds but this was quite scary. Before and after this moment everything was as normal.
I had just taken off and was doing a fairly high speed forward flight agains the wind. It was quite windy (10-15 m/s).
If you look in the attached log, you'll see that at around lin 15740 there is a large spike in the roll value.
Can anyone comment on what might have caused this?