Computer tech-types: what's this called?

[EstimatedProphet]

I have a sucky mouse that refuses to roll properly. When I drag it, the cursor will get close to where I want to go, then quit, and it seems sometimes like it knows where I want to put the cursor so it refuses to go there. Whenever I drag the cursor anywhere it will only go partway, and then stop, and often if I pick up the mouse and try again it still won't move properly. I know this is due to dirt usually, and I know that in this case it's because the mouse sucks (it did this from day 1) but other than getting a better mouse, what can I do?