iPad touch screen problem - self touching!

Since the second day I bought this iPad I found this problem, the iPad will just tab on the screen by it self in almost any softwares. For example it can open software, click link in browser, zoom in and zoom out in video playing. While I think that might cause by the original plastic film as I was waiting for the apple case so I left them on, but the problem is still there. It does not happen often but it is really annoying when I am browser it just start to tap things like crazy, and I have to restart iPad or let it sleep for a while to bring it back to normal.

So I recorded a short video when it happened once, and showed it to one technicist in the retail store as it is really hard to show the random problem on the iPad. But the technicist helped me said the video is not helping, and they have to see the problem directly on the iPad.

Any advices? or does anyone have the same problem?

Check the video I recorded here: http://www.youtube.com/watch?v=-Dps_ihwDuk