It happens at least once on nearly every sentence with mine, totally at random. I'm reasonably sure I don't suffer from any type of palsy. It's driving me batty.
UPDATE: stargo saves the day here: http://forum.xda-developers.com/show...5&postcount=44
stargo's Milestone2 Debounce:
"If anyone with non-working keys or still bouncing keys feels adventurous, I've now additionally enabled the hardware-debouncing feature of the OMAP processor on the input-pins of the keyboard matrix."