I have had mine since Nov 2010. Not a problem of any sort. Have used it very consistently.
I agree, the negative comments come to the fore, whereas the positive comments are not the quick to speak out, but just go out and happily get their shots.
All camera makes have problems arise here and there, and I personally do not believe Pentax is anymore than any other.
# I was going to comment about that photo, but it seems to have disappeared.
NOT!
Interesting photo, I must say, forget about the sand, it may be worth it.