The fix for me for this (I had it for months) was pretty surreal and like most folks I didn't believe it until I did it:
Some MS mice have a scrollwheel bug.
Try unplugging the USB cable / dongle then plug back in.
Also, I noticed that if you have the dongle plugged in to the computer and the mouse has an on-off mechanism then you can just turn the mouse off and back on. That resets the data link between the mouse and dongle.
source: https://askubuntu.com/questions/22589/how-to-change-my-mouse-wheel-scroll-rate
