Routine flying went wrong (Crash)

I used to fly my hexacopter every Wednesday and something went wrong today. Pls tell me what went wrong if u know.

I went to fly at the same field today, It goes pretty well except the drone is a bit less responsive, probably because the wind is slightly stronger today.
It looks totally normal for two flight and the beginning of the third. It lost power at about 10 meters high and fell, snapping the GPS stand.

No major damage to the drone itself and spare parts doesn’t cost a lot. Yet I assembled it is for aero photography and videography, I can’t risk breaking a 300 dollars gimbal and a 2000 camera.

spec below:

F550 Hexacopter
6 935kv EMAX 2213 rotors + 1045 props
Hobbywing Xrotor Pro 50A
4S 14.8V 6500mAh
Pixhawk 4

I do some search and found it probably a RCOU issue, but I don’t know how to adjust it. I also recalibrates the ESCs even I done it before. FYI, I fly with default pids since it flies stable at poshold mode.

And here’s the log file of that crash flight: