So, in summary, it happens to most Pandoras to some degree. But if some people don't get it badly it must, as Ingoreis suggests, be something to do with a variable quality in manufacture of the hardware.
I find the nub reset is essentially a random process. I generally get a different kind of problem after doing it, so press it a few times until its OK. I honestly think Thinkpad-eque nipples would be preferable to the current nubs, albeit far from ideal themselves.
"All in all, I don't think its a very big issue, but it's certainly a little bit annoying when it occurs."
For me it is unfortunately.