Was there ever an update on this? I remember reporting I had this problem with Vassili only when scoping in and out a few times so I thought this bug was related to the sniper only but last night I was getting this bug with any and every merc.
What is weird about the bug is that it isn’t just slow sensitivity. It is slow sens, with input lag, and negative acceleration. I thought this game didn’t even have mouse acceleration in it? There’s a noticable delay in the mouse movement when this bug happens, and the faster you try and move your mouse the slower it goes, so I don’t know where the negative acceleration comes from. What confuses me even more is that every single time you respawn the sensitivity is normal for a very short period of time and then it slowly progresses to a random unplayable state the longer you are alive. It makes no sense at all.
Just updating you on this any way with that little bit of extra info. Hopefully it helps in some way.