Northener:

Could be that this is a common problem - but I'm not convinced yet. The "90%" that you're observing is probably a bit misleading. Could be that it's 90% of the people who look at this thread title and take an active interest, and that could be primarily people who have a dust problem, skewing the stats somewhat.

I've had a curve for many weeks now, using it extensively every day, and I know at dozen other colleagues who are also using curves over about the same time frame. None of them have reported a dust problem yet (and most aren't as careful with their curve as I tend to be with my mobile equipment).