Try removing the FPS limitation ,I had similar problem where the mouse sensitivity would drasically change by its own and this fixed it. And put the polling rate on very low in your mouse app.
I get it all the time with my 20 year old mx518 - i have to reset camera default & or keybinds to default & it works, but I have no keybinds so easy for me…
Hey all, there’s a fix for this issue it’s to do with a few things but the FPS settings fixed it for me.
I’m on mobile atm so can’t easily get a link, but there’s a blue post in the bug fixes section (might be USA) which gives a guide on fixing it, could google “wow mouse look bug” and should link it, else I’ll post it tonight if anyone replies needing it.