Currently I use a QAV400 with 1100kv motors, 8x5 props on 4s with AC3.1.5.
Had several successful AutoTune steps with the other Copter I got.
I put the QAV400 into AltHold and the Autotune it stated twitching left right and so on but then suddenly stopped. I had to land disarm and rearm the copter to start again but with the same result....
Whats wrong did it reach max or min PID values?
Attached the log file of the flight.