After the now known, severe and random under exposure problems, which led to a complete mirror box replacement under warranty, my K-30, after about another 5000 clicks, started acting up again.
I'm now putting my 18-55WR on it and will NOT handle it with any care. I will not break it deliberately (not that kind of person), but I hope something happens to it that warrants an insurance claim. It is so unreliable at the moment, that I've reverted to my K-x as backup to my K-5iis, for occasions that I need accurate exposure, and can not go back or take time to do it over again....
I'm now using it in hi, continuous mode, and hope I get some photos without having to spend hours in PP to try and recover something usable...
I've started with my K1000 in early 80's, and am planning to get another K-5iis or perhaps K-3, as soon as my K-30, or one of the others, decides to kick the bucket
I'll not spend another cent on it (now out of warranty)
Definitely my worst experience with any of my Pentax products in more than 3 decades.
BUT don't worry.... I do not have any plans of jumping ship!