Arducopter disarmed randomly and fell out of the sky

I was doing test in flowhold. Switched between POS hld and FLOW hld. Was flying at 50m alt. After hovering for a bit i was looking at the laptop (GCS) to look at the map and suddenly i no longer hear the drones humming. I look back at the drone and it is just falling out of the sky. The GCS said “Disarmed” through the speaker as it was falling down.

LOG
https://drive.google.com/drive/folders/11xjm_NViANtPkyzlcqU_Sirgj450dCOn?usp=sharing

Thanks in advance!

CPU Load watchdog. Failsafe Triggered (normally vehicle disarms)

https://ardupilot.org/copter/docs/common-radiolink-minipix.html

Warning

The RadioLink CrossFlight is not supported by ArduPilot. As far as the ArduPilot Development Team is aware, RadioLink are in violation of ArduPilot’s GPLv3 license in that they refuse to release the source code for their modifications to ArduPilot. The Development Team recommend you do not purchase this product, and instead select from one of our many other supported boards.

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Take that up with Radiolink Support.