Q: The trackpad cursor starts loosing control and jumping across the screen

me bought the macbook air 11 (mid 2012) yesterday on second market. It was unused for 3 months before I turn it on. I've updated the Mavericks to ver 10.9.4 and then the trackpad problem appears(not sure if maverick update is the reason, but previous owner said the macbook worked fine and was unused last 3 months). Sometimes cursor loose  control and jump across the screen,  randomly generating two touch swipes. I tried to update os to yosemite but the bug is still there. I noticed that the issue appears most frequently while the macbook is getting hot while performing heavy operation.

Tried to deassemble my macbook and clean the trackpad properly, checked the battery - looks fine, no bulges.

Still no solution for the problem found.

At this moment, I'm performing a clean installation for maverick 10.9.4. Already got the trackpad issue at installation screen, so definitely not a software problem at all.

Looks like the only one solution is to replace the trackpad

My suspicion about the problem is that something inside macbook is going wrong while it gets hotter and it affects on the trackpad.

Can anybody approve the suspicion?