My brother and I have been playing Classic World of Warcraft since launch day about a month or two ago. We have been experiencing frequent and constant disconnects every day since launch, with nothing else being affected bar the game.
When we disconnect, the internet is completely fine and stable, with voice comms, streams and WiFi on mobile devices all staying online with no issues. The disconnects are specific to WoW.
We are on a wired connection, and we experience the disconnects with varying degrees of frequency. Some days it's every 20-30 minutes, and on others it happens every hour or two.
I have seen that many VM customers are experiencing the same issue, and hope we can all reach some form of resolution so we can finally enjoy the game without constant disconnects.