screen twitching and unresponsive

[wustehase]

What would. cause a screen to twitch rapidly and not respond to touch input at all (or if any, just sliding the screen one way and then snapping back)? My phone has been driving me nuts for the past couple days doing this. On the TF3D page, it'll twitch and hover between any of 2 tabs, or fling all the way to programs, or keep the home icon selected (over the top of the clock). On the start menu, it'll slide to the extreme top or bottom, and sometimes flings icons around.

Extremely irritating, lemme tell you.