Mouse Sensitivity Changes for No Reason

I have just begun to have this weird problem with my mouse recently. The windows mouse sensitivity changes suddenly, without my doing anything with it. I could be playing a game, I could be surfing the net, or doing just about anything, and it would suddenly change its sensitivity to a much lower speed. The even weirder thing is
that when I check the mouse sensitivity in the control panel, it is as if nothing was changed, the speed tab stays at exactly where it was, but the actual speed is much slower. I normally have the sensitivity set on middle and have acceleration disabled.

I have Win2k, Service Pack 2, and an IntelliMouse. Any help would be appreciated.

Thank you,



David