Hi,
Huh? What button?
The one named "Open button" in this pic: http://www.amersol.edu.pe/ms/images/ibookeyboard_1.jpg
For me, it also happens without touching it at all, just by moving from one room to another or such.
Well, this also happens on my iBook from time to time, but frequently pushing the button given above leads to a 100% chance of appletouch fuzziness. Cheers, Sven