Quest 3/ Air Link stopped working/ No connection to PC/ PC found but Start Button is greyed out...

[Playsianer]

I've been using the Quest 3 for almost 8 months now, and before i used the Quest 2 without any problems via Air link/same router/same PC...

This Saturday I'm playing Borderland 2 VR and on Monday the Quest 3 can no longer connect to the PC without any reason.

If I want to activate Air Link via the Q3, my PC is displayed in the Air Link Menü as before, but the Start Button for Air Link remains gray and it says "not connected".

I've already tried everything:Hard reseting the Headset, factory reset, router reset, PC & Quest 3 reset, Meta Quest Link restart via the beta menu in the PC Oculus APP, repair function of the Meta Quest APP, firewall completely switched off but nothing...

Then I read that you should completely delete the Oculus software with all folders and reinstall it.
I did that and lo and behold it worked, for exactly ONE day....

When I booted up my PC today and started Quest 3, the same problem...
The PC is displayed but the start button to start Air Link remains gray and it is not connected.
WHY?
Do I have to completely uninstall the software every time, including all folders, then reinstall it in order to be able to play via Air link for exactly ONE day, which has worked for over 3 years before (Quest 1, Quest 2, Quest 3) without any problems?

The connection works immediately using the original Meta Quest Link cable.
Virtual Desktop APP works also...

PLEASE Help!

[oculusness]

@MapleCinnamonVT  what suggestions have you tried?