Ok, I thought you would have figured that one out, just checking. Try a different USB port. Another thing could be your mouse-pad. Since it's only happening in-game, update DirectX. I have also seen online people having issues with mouse input with Windows Aero enabled, and software that changes the look of the desktop to resemble older Windows versions: vistaswitcher, windowsblinds. I have personally deleted windowsblinds because it altered my mouse input. If those things aren't the problem, look at this article on the steam community, someone with your exact mouse having the same issues with CS. Something to do with IPS:
https://steamcommunity.com/app/730/discu...056728061/
https://steamcommunity.com/app/730/discu...056728061/