I’m having an issue as well, but it happens every 2-4 months. There is a bad hop somewhere which disconnects the Battle.net app which in turn disconnects me from WoW. I’m assuming the issue is found and corrected at some point, but it’s normally a week or so of annoyance.
I am in Chicago using Comcast/Xfinity wired, normally able to get 1gig download speeds. Other apps and the computer work fine, just that disconnect from BN. If I use a VPN I stay connected, obviously the VPN is taking a different route.