Plane start spinning on Stabilize mode


Could anyone please help me identify what happened with my Plane on this log file?

The plane was flying fine on Stabilize and Manual mode, but at exactly 17:34:18, the plane start spinning and nose down. I took a few seconds to switch to manual and was able to recover and land safely.

What happened? Maybe a sensor faulty?

APM 2.5 board
Firmware 3.1.x
No air sensor
GPS Neo 6m


Just took a quick look, but appears at that time you flipped into AUTOTUNE mode. How does it fly in FBWA? I could see that transition causing the instability

Good luck!