Stability Issues on 4B

My Rockpi 4B restarts around 2-3 times per day. Does not seem to be related to load. How can I pinpoint the cause of reboot?

Running 1 daemon only (a custom monitoring thing). CPU load is <10%. Memory load is <50%.

Running Ubuntu 20.04.05 LTS. Should I switch to Armbian?

1st thing I’d check is the power supply - try replacing it with another one

I’m using a 65W GaN power supply with a 100W rated USB-C cable. I have a few GaN bricks, I’ll try another one.