Strange behaviour in terms of ip

Hey folks,
recently I’ve been having a strange problem with my home assistant setup. It seems like it’s an IP or DNS issue.

All of a sudden anything related to IP (ssh commands, WOL my Computer, nabu casa cloud) stops working. The entities and automations just work fine but any automated ssh commands, my WOL automation for my PC and also nabu casa cloud isn’t working for no reason.

I think anything stored in the browsers cache like the dashboard is working fine, but I neither get access to the settings section nor restart HA using my browser.

The only thing that solves the problem is hard resetting my ha server. I have a dedicated system just running home assistant.

Any ideas why this could happen?

Couldn’t find anything within the log files after a restart, is there any way to access logs from before the restart?

Thanks in advance