Why would that be and all of a sudden too...??

"I have not been able to find the Whatsthebest audio forum"

You're not finding it because there is no such website.

Perhaps you're seeking to read about "what's the best' so go here:

https://www.whatsbestforum.com/

I'm having similar issues - have not been able to connect to it for a week or so. When I click the link provided by tablejockey, I get a message saying that it can't find the page.

This is the message I get -

Hmmm… can't reach this page

It looks like the webpage at https://www.whatsbestforum.com/ might be having issues, or it may have moved permanently to a new web address.

ERR_FAILED

I just connected to it with no issues using Mozilla (Firefox).

For the fun of it I'd try deleting all your browser history and cookies

I'd also check for a browser update