I am experiencing the same issue.
I was playing 2 or 3 nights ago when it was SO LAGGY it wasn’t even possible to play.
I assumed my internet was having an issue so I went to bed.
The next day this error started and I haven’t been able to play since then.
I’m on the same page as well. I cannot even get any of my games to update at all. The update agent won’t wake up, and won’t be able to play unless I get it to work.
From Toronto or Canada? On ROGERS? Looks like there’s some kind of throttling with the Eastern WOW servers, if you have a VPN, I set mine to Texas and that worked.