Putting my two cents in to say it may have very well been a DDOS attack. The realms on World of Warcraft Classic were/are getting hit pretty hard, most notably the PvP servers where many of the streamers play.
Here’s what was just recently posted by a Customer Support agent on the WoW forums:
Yes folks, there are issues.
And no, I’m not going to give virtual terrorists any exposure by going into more details.
Being worked on.
Thank you for your patience.