[Milhouse]

So the server is pretty much across the street for me (I'm from Frankfurt).

https://db-ip.com/138.68.75.163

Postal code 60313, apparently

Again, it only happend once per boot. Also not that much of a big deal, just a tiny bit annoying.

Then again, it might be my router as it's in service for about 5 years or so. Maybe it wants to retire

Can you post your kernel log using dmesg | pastebinit (or click the crash log option in LibreELEC Settings) and then post the link..