Since the patch came out, I am 100% guaranteed to get a softlock (almost all the time) or a BSOD hardlock (rarely from WoW) within half an hour of gameplay, and almost always within the first 10 minutes of logging in.

My addons are as follows, all hard-updated daily. ElvUI Details Auctioneer DBM Core Weak Auras

(And associated dependencies in each addon)

I'm on a dual monitor setup, with WoW only on one monitor, as forced in the settings menu in game.

I ran the same configuration and addon suite the entirety of 8.1 with zero errors, softlocks, or BSOD.

When WoW softlocks, I can do things on my other monitor as normal, and music-only audio will still come from WoW, but I can't even close it with task manager, I have to do either a system reboot with windows or a power button reboot.