K5 locking up --- more frequently

is it happen with the same sd card ?

for me it has occurred with an old sd card, just before the k5 locked, the pentax tried to write on the card, and the camera stopped running, then i bought a pretty new card and everything goes fine !
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my flickr : http://www.flickr.com/photos/kimdokhac/

my PPG : http://www.pentaxphotogallery.com/artists/kimdokhac