This was an issue I faced early in Legion but was solved at some point. Well, it’s happening again. If I accidentally go into Mission Control or let my machine go to sleep, when I come back to WoW it freezes up and crashes. Only a force quit will get me out of it.
MacBook Pro (Retina, 15-inch, Mid 2015)
2.5 GHz Intel Core i7
Intel Iris Pro 1536 MB
10.14.5