Without moving my mouse the screen in mouselook pans down slowly to the ground without the stimulus of my hand moving the mouse. Acting as though I am moving the mouse back to look down. I have checked the mouse, cleaned it, and tested the mouse in other games such as Arma 3, Fallout 4, Arma 2, Fallout New vegas, and War Thunder. Worked perfectly. I have also tried all three major viewers. SL viewer, Firsestorm, and Singularity. This issue only happens in mouselook, and started 2 updates ago.