When using my laptop, my mouse will at times not move. Also when typing, the curser will jump from where you are typing to other areas on the page (to the middle of other words, beginning, or who knows where
I'm not sure about the first problem (mouse not moving), but the second problem is often seen w/ laptops when the user inadvertently comes in contact w/ the touchpad. Certain ppl are more susceptible than others due to differences in typing styles, and/or the location/sensitivity of the touchpad itself. At times, I myself have had to disable the touchpad in the BIOS it’s been so bad. A lot of ppl just don't notice they're touching the touchpad, and so remain stumped.
Not a guarantee that’s the problem, but I’ve seen it happen from time to time.