Trying different Firmware versions did also not work. I contacted technical support now to find a solution, will update further when something new happens.

@Aboodi_8 One thing I am trying now is to just re-install the firmware despite the most current one already being installed - thought is, maybe there is an issue with how the router was shipped and...

@Aboodi_8 Sadly not, after some more messing around I have figured out one more key pieces of information. The entire firmware just seems to crash outright. I confirmed this by connecting a lan cable...

@1999ben Checking a bit futher, doesnt look like its really dependent on the time either - just seems to happen when a specifc device - in this case my desktop pc - connects. Then the internet access...

Hello Everyone, I have a small issue with my new router. Essentially, once a day it fully looses connection until restarted and I cant seem to find any good reason as to why. No downtime or overloads...