Someone has done an experiment recently and found out the possible root cause of the K-5 mirror flopping issue:-
http://forums.dpreview.com/forums/readflat.asp?forum=1036&thread=38904425
It is concluded that it is a design issue, i.e., problem may happen for freshly charged batteries with higher voltage. Do note that original batteries are used in the test.
Next, yet another K-5 user has reported that the e-dial of his K-5 has stopped working, just like some K-r users encountered before:-
http://forums.dpreview.com/forums/readflat.asp?forum=1036&thread=38937756
And then, a new K-5 user has had his K-5 AF malfunctioned only in 5 days and his unit now behaves in an erratic way, see his recently recorded video:-
(Above: Shockwave Flash File; URL: http://www.56.com/u94/v_NjE2MTM5ODc.html)
via http://forum.xitek.com/showthread.php?threadid=889568
(in Simplified Chinese, Google machine translation to English here)
The serial number of his K-5 unit begins with 403, which is amongst quite a new batch of the production. But still.. The user has made such a joke himself, the 403 s/n is just an unlucky number from the beginning, as when you visit a web page, returning an error code of 403 is simply not a good thing, as it just means "Forbidden"! :-o