Originally posted by AfterPentax "It seems to happen when I'm trying to take several shots in rapid succession. " your manual will tell you that the camera is justprocessing the shots. Look it up in the manual under solving problems.
Ah,
maybe I understand - are you using an "old", and thus probably very slow, HDSC card?
If you are then the camera can't clear the data from the buffer on to the card quickly enough - happened to me many times with the K3 & K3 II (and more so with the K-30 and K-70 which have much smaller buffers, although the K-70 is much better). Solution could thus be to get much more modern and faster HDSC cards
For comparison purposes, I can probably shoot about 15-20 RAW+ (RAW and High Quality JPEGs) in "maximum machine gun" mode before that happens when using a 60Mbs Class 10 card in the K-3s, but only about 7-8 with the card in the K-70.
The clue comes from the flashing red LED on the back of the body - if it is still flashing when the shutter won't fire then the buffer is still clearing data to the card, When that flashing stops stops then you should be able fire the shutter should again.
If those symptoms mirror your experience then that
may be the cause of your problems (??).