Does your mouse not stop scrolling?

Was having this problem, and suspected an electrical issue, but upon closer inspection, the mouse uses an optical encoder to detect scroll wheel movement. I had a bit of carpet fluff inside the wheel which was confusing the sensor and causing continuous down scrolling. Taking off the cover and removing the fuzz with tweezers cured it.

I needed help.

Couldn't find the answer.

Fixed it myself.

Left the advise I wish someone else had left in case someone else has the same problem.