Hey all,
I know that this is frustrating but our Developers are currently investigating this for us based on all the reports we’ve received about this. If it’s possible, can any of you that have WoW installed on a “regular” Hard Disk, and have access to a Solid State Drive, try moving WoW to the Solid State Drive as that has seemed to help a number of players experiencing this.
Another potential workaround is to fully reinstall the game. I know that this may be inconvenient for those on slower internet connections, so please only try this if you don’t mind the wait for the game to redownload. If you would like to try, you can you follow the steps in this Guide (there is an Advanced Troubleshooting section here that I would also advise you to work through) to uninstall the game, and once you have done that, reboot your PC, and then install the game again. You can do this either from the Blizzard app, or from the Game Client download page.
Once again, I’m sorry for the inconvenience this is causing you all, but if the above steps don’t help, our Developers are investigating as well and hope to have a fix soon.