how to fix a track ball mouse?

ok, i have the microsoft wireless ball mouse. it's been good to me for about a year but lately it's been slipping. in games like cs and even in normal internet programs if i move the mouse sudenly the ball slips and the cursor goes no where, that gets real anoying when i have to make a sudden turn to shoot someone in cs. i know a lot of you will say "just buy an optical mouse" but i want to know if there's anyway that i can repair my mosue so it doesn't slip. i celan the little rollers all the time so there's no gunk on them, is the ball too slippery, or is the mouse just at the end of it's life?

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