Happens all the time. Multiple people on other forums(reddit, etc) having the same issue going back months.
I can try and start the game and kill the task over and over and it will not load beyond about 29-31 mb of ram and then it just sits there stuck. Tried loading directly from the WoW executable without using the launcher, no difference.
Tried the disabling of the antivirus and a whole lot of generic “go away and do this random stuff” excuse for technical support saga … no change and then magically it will just work again without having done anything to cause it to work.
Sometimes if I leave the process in task manager and come back 15 minutes later it will have eventually started from this suspended state. It is as if the client is trying to get info from the server and there is no response and it just sits there.
Tis never used to happen til about a year or so ago.