I see there are many other posts about this issue but roughly every 1-2 hours I will get disconnected from World of Warcraft Classic for seemingly no reason. Also recently my connection had just died all together and my router has restarted itself.
Thank you for reaching out to us in our community, I am sorry to hear you are getting disconnected from your world of Warcraft game.
I have checked our end and cannot find anything that could be causing this, I have searched online and can see other users with other ISP's are also having this issue.
I have check other sources and have found a video here which may help.