Debugging error

Hi I have a pc router with OpenWrt 21.02.2 and from time to time the router goes into a loop where I get disconnected from the LAN and WAN, so the only way I regain connection is to power off and on. But I can't find the logs and don't know where to start. The only thing I have is the following picture showing the loop.

If anyone can give me a hint on what to do next, I will be grateful.

v21 is EOL, upgrade.

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