I am also having issues with Windows 10 and Avast Premium Security. My laptop, which I've used at home for months without any issues, has today refused to identify my home router and set it to Public and Untrusted (which I've now changed to Private and Trusted).
When I select the router from the wifi list in Windows, Avast ignores the name and displays it as "Unidentified Network", shows it as Trusted, but I can't access the internet at all, which means no AV updates or anything.
When I switch router names (I have a standard profile and also a router_5G profile set up) I can't get internet under either profile.
I'm on program version 22.2.6003 (build 22.2.7013.717). W10 is fully up to date.
Any suggestions as to how I can get my internet access back?
If I try to run the Windows wifi troubleshooter, it reports back as "Wifi doesn't have a valid IP configuration"