Originally posted by Adam he K-3 didn't have any quality control issues
The only thing that comes to my mind is the runaway mirror syndrome which was addressed under warranty and which affected a fair number of early bodies* made before late summer 2014, though the problem was hardly universal. Firmware v1.11 included a feature to address the symptoms without actually correcting the underlying timing issue. FWIW, I have never read a report describing just what the camera actually does when the feature is invoked.
FWIW, my K-3 has never showed the problem; my shutter count is just shy of 23,000 with original battery.
Steve
* There was quite a stir at the time. Incidence was hard to pin down, but common enough that a few users had the problem on more than one body. The problem seemed to be associated with heavy/frequent interval shooting, though not exclusively.