IBM T60 laptop: Mouse uncontrollably scrolls at random

I have seen this on 3 brand new T60 laptops including mines.

I could be randomly working in a Microsoft application and suddenly, the mouse will crazily scroll in one direction.

When I try to pull the scroll bar down, it shoots right back to the top or bottom. It happens randomly.

I used different USB mice, uninstalled and reinstalled the mouse driver on each machine, checked the mouse options in Control Panel and it is still doing the same thing.

Any idea? Thanks.