Mouse randomly increasing sensitivity in two games and randomly stopping in another.?

In both World of Warcraft and Garry's Mod my mouse will randomly speed up while I'm using it (aiming my character/gun) then slow back down.

In Warcraft 3 (I've only noticed it on the map Archer Wars) my mouse will stop working, (I may hear some beeping from my comp) and then it will quickly catch up. The main problem with the Warcraft 3 one is that it isn't randomly, it does it every time I try to shoot at someone when there is a few people around.

Is this my mouse? or maybe drivers?
Anywho I have Vista 32-bit and a "IntelliMouse Explorer 2.0A USB Compatible" mouse from Microsoft. Thanks in advance for your help.
 
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