Routerboard 433 Kernel failure every hour

Ive got 1 specific RB433 that reboots every hour, due to an kernel failure

On it ive got 3R52hn cards, 1 is disabled. \

The board was working perfect for a year, and now all of the sudden this happens. I use 12VDC and Ive got 2 other rb433’s connected with that one on a mountain. Ive got 350AMp Hour batteries, and voltage never drops below 11.9V. When that one drops, the other boards which each have 1 R52hn in it, works perfect.

Any suggestions?

What routerOS and what routerboot?

Im running 5.20 with 2.41 firmware

Picture shows what its doing, does not show Current Firmware, only upgrade firmware
Routerboard error.png

You have NO current firmware. It causes kernel failure.
Try:
/system routerboard upgrade

I tried that a few times allready, it just loses the firmware

Happened again, look at the profile. I am not running SNMP,usage just spikes to 100% by “Management”
Routerboard error2.png

I dont know what couses it, but sometimes helps:
/system routerboard settings set force-backup-booter=no
/system routerboard upgrade
/system reboot