I just did an autotune flight with the copter, cube black + herelink all axes tuned fine, no problem, copter behaved stable.
Then I set COMPASS_LEARN to 3.0 and armed to do a compass calibration flight. After a few minutes without warning my GCS says: “Warning stopping vehicle motors” and it falls out of the sky.
In the logs it switched to stabilize without reason and detected a land, red is the motors stopping, green the vehicle hitting the floor. Rangefinder is fine when it happens (blue). Flow sensor and GPS too.
Logs:
https://1drv.ms/u/s!AuKkq6JXpbFTzuN5RVIg4ii89z3lrQ?e=KXg2BP
Any ideas?