I may be wrong but I think that it is something to do with dust or heat.
In my laptop it happens because the harddisk is quite close to touch pad and so it heats up and starts acting wierdly.
I"ll suggest you to clean the heatsink either yourself(if its out of warrenty) or go to the authorised store and get it cleaned. maybe that could solve the problem.
But keep one thing in mind, if the problem persists and you don't get it fixed during the warrenty. Then after warrenty lapses, you may have to shell quite a few bucks.
P.S. you can also use a USB mouse until it gets fixed.