Start in QSTABILIZE, switching to QHOVER always perfect.
Transitions, Backtransition, FBWA,B and Cruise also.
Finally testing QLOITER. After selecting, small vibrations and suddenly hard pitch.
After immediatly switching back to QHOVER, pitching more and finally crashed with full power.
I recognized a Lane switch 1 message in the log and a Compass Reset.
Log : https://drive.google.com/file/d/11IJQe9AOzNYETziU5WCY8x5S3sjofxMb/view?usp=sharing
Video : https://youtu.be/szaH8CMBIVU
Solved: The crash was produced because the BEC for the Servos reduced Voltage after 2 Min to 2V.
Was to reproduce on the Bench. UBEC from HobbyWing.