Same issue on my WLMouse Beast X FAB while on 8khz. Haven't noticed it on 4k. Maybe I haven't played enough.
The higher the refresh rate, the more pronounced the random deceleration effect of the mouse. Sensitivity seems to be variable rather than fixed.
I think this bug is caused by the following updates:
Fixed bug that caused high polling rate mice to occasionally encounter high frame stutters. High polling rate mice users should now see little to no frame stutters from mouse input.
Input and window processing now occurs on its own thread instead of the render thread.
I haven't played Apex since this issue occurred.
