I feared that might have been your problem; mine too suffered from the sticky aperture blade issue. It was very quickly and professionally serviced by Fujifilm Canada - shipped from Vancouver on a Monday, returned to me by Friday that same week - both ways and repairs of course on Fujifilm's dime. The "fix" involves replacing the entire lens assembly.
So far I'm unaware of any repaired cameras having a confirmed report of recurrence of the problem, so it seems that the fault is truly a manufacturing defect that Fujifilm has since rectified. Some users report hearing from Fujifilm that they are aware of the problem affecting known batches - I'm not so certain about that myself as the serial numbers reported don't seem to paint a pattern, at least not yet.
Cameras affected appear to start to fail fairly early on - 300 - 600 exposures or a few more. Early failure can be intermittent but as the exposure count goes up, failure become regular. When intermittent a new user may shrug off the problem as user-error, which may also explain why it takes a while before people contact Fujifilm or their dealer for assistance.
In my city alone I'm aware of a few users who have experienced the issue. Certainly Fujifilm Canada is well aware of the problem and to their credit they handle the warranty service very professionally indeed. U.S. users also report good service; there have been some reports in the U.K. of occasional service hassles and Australia was caught short of parts at one point. Fujifilm worldwide needs to continue to address this issue professionally and in a similar manner across the globe or they will lose the terrific head of steam they have on the X series platform.
Myself, I've just sold mine. I already miss having the camera but decided that I love the form factor so much, and dislike the DSLR form factor so much, that I'm going to invest in the Sony NEX 7, some E-mount glass, and, perhaps, adapt some of my existing Zeiss glass if appropriate adaptors for Contax/Yashica mount are available, assuming that doesn't make the NEX 7 stupidly bulky.