Hardware problems

I’ve been having problems with my laptop. The mouse pointer moves, all by itself, to either the top right or bottom left of the screen. I’ve just disabled the pointer stick, and that seems to have cured the problem – I’ll have to rely on the touchpad instead, which suits me fine as I prefer using it anyway. But it is a little annoying. And I don’t think I want to return the whole machine under warranty to get it repaired, as I don’t really want to be without it for something so minor.