I've had problems with multiple letters from a single touch when my NC is plugged in. The only time I've see phantom touches, and multiple page turning (or just jumping to a completely random page) is when I get the screen outright wet. I suspect heavy fingerprints from an oily finger might do the same thing. And once it starts that, it won't work right even after I clean the screen until I turn it off and back on (but not a full reboot).
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