i dont know wtf they are doing but since today the game is just freezing and locking up and restarting my pc, ever since i seen some little update there earlier game’s just unplayable right now, it’s only been happening in dungeons btw.
I changed the graphic API from DX12 to DX11 and the problem is gone
The FPS dropped though
Or Problem with MS..
Had this issue for months , went back to DX12 last week and almost 5 days no issues and today same issue screen freeze all goes black and then screen resets . So i guess it is still a DX12 issue , what i want to know is it an O/S issue graphic card issue or Blizzard ?
Coming back to this post as I have continued to have the problem of 3-5 second game freezes during dungeons for many months now.
Quite randomly I stumbled across a youtube clip linking the game freeze problem to playing sound files. I tried some stuff suggested in those youtube videos about disabling disk indexing etc but it doesn’t seem to work for me. What I have now noticed is that every time I get the freeze when the game restarts I do immediately hear a sound file being played such as “AOE”, “Beams”, “Affix” etc. Needless to say most of the time there is no issue playing the sound file but it seems that occasionally there is.
The audio prompts are supper helpful but I guess we will lose all that functionality in Midnight anyway.
The problem is not only with dungeons and raids. Just open the transmog UI and the game will freeze more than 5 seconds. Also the memory of the graphic card will overflow and the game will try to restart it.
PS: i saw a post that nVidia have release a Hotfix display driver (beta) version 581.94.
Somehow i can’t post the link here but if you search it you will find it.
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freeze is still in game no matter patch, settings, addons happen me today in dalaran so is not only dungeons or raids. Any tips it will be in midnight? 
Unfortunately you have to do as I do. Change from DX12 to DX11 until nVidia and Blizzard fix this problem.
PS: your fps will go down but no freeze.