http://forums.dpreview.com/forums/readflat.asp?forum=1036&thread=33243488
And the posted photo of the "separated" lens is linked:-
In fact, this is not the first time I see such a reported case. Last time I saw in a Chinese forum that a DA pancake lens was automatically self-separated into two pieces like this, exactly (the link of the post cannot be found now, though).
So, the durability and reliability of those super-thin Pentax pancake lenses are now in question. Is it horrible enough to see a lens to self-disassemble into two pieces like this? Really something unimaginable, I must say.
Update (10-20): One More Recent Adverse Report..
http://www.dchome.net/viewthread.php?tid=772742
(in Tradition Chinese)
The whole focusing assembly of his new DA 21 which purchased only one month ago has loosen and there is great play. The user questions about the "limited quality" of the limited lenses. Well, what to ask actually? Pentax has told us already! From the words "limited quality", it just means the quality is limited! ;-D