I’ve found that thruout all of the Expansion Zones, sometimes I will lose control of my character’s movement to where they side run or auto run. Idk if it’s a graphical thing or my internet.
Secondly, I used to be able to pop YT on in my browser while playing WoW but now, YT will randomly stop working while WoW is running. YT still works normally when I do this for Classic, only affecting Retail.
You might also check and see if you are hitting the auto run hotkey. I disabled mine since I never used it anyway and would sometimes accidentally hit it.
Edit: After more looking around I saw a thread from earlier than year where a reply managed changing the power settings on my computer to high performance (it was set at balanced) yt seems to be working with wow now.