As expected - Roon worked for 3 hours today… Then the Roon remote froze and i got the lost connection pop up.
As you can see in the event viewer, it then started erroring again:-
I then lost network and had to reboot the Router.
Not sure if this helps you - but if i reboot the router without the Roon server running and THEN start the Roon Server afterwards, the problem persists. The Roon server has to be in a running state when the Router is rebooted for it to fix the issue temporarily.