Hi Daniele,
Thanks fo rthe information, I have completed the factory reset setup the wireless aand guest networks again.
Now the admin page is loading but nothing is connecting to the 5ghz network anymore (it was before the factory reset), this is making video calls jumpy and low connection speeds are making work difficult/impossible.
I am typing this 1m away from the router in an uncrowded room.
Please advise the next steps for troubleshooting.