I had a mirror flop (mine cycled really quickly like as if it was in super high fps mode) on the K-r when I first got it and it only happened when I put on a particular lens. I then compared the lens that caused the mirror flop to those that did not cause the flop. Nothing seemed to be out of the ordinary except that the affected lens had it's aperture lever bent slightly more inward then the other lenses. It was about 1-2mm off of "normal" so I gently pushed it outwards and reattached the lens. It worked fine ever since. No more flopping on my k-r. I am not sure about your camera, but in my case I think the aperture lever on the lens was not able to correctly connect to the camera's aperture "actuator." Good luck and I hope the problem is solved soon! The K-r is an amazing photography tool!
P.s. In my case I could have asked for 50 new camera's and they probably would have all been sent back... So have a look at your aperture lever and see how "straight" it is. I think I pushed mine about .5-1mm more than "normal."
Last edited by theperception2008; 06-27-2012 at 05:09 AM.
Reason: added post script.
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