Originally posted by Mikie I have the identical problem with my K50 as the original owner post here. The problem came on suddenly. The camera is less than a year old, but unfortunately I bought it on-line from Amazon and have no sales receipt (my bad) to confirm the warranty. I have taken it to a local camera shop and awaiting word on the possible cause. Very unhappy as I am sure repairs will be costly.
Welcome to the Pentax Forums! Sorry it is under such sad circumstances.
Your Amazon order confirmation e-mail is your proof of purchase. Alternatively, the order history on your Amazon account may be used as documentation. That being said, your U.S. warranty will only apply if the seller was authorized as a dealer in the U.S. and the camera was originally sourced from Ricoh N. America (i.e. not gray market). If not, you may still have remedy through Ricoh, Japan though whether that makes sense given the time and effort involved is debatable. You can contact Ricoh/Pentax USA directly to determine whether they will warrant your camera.
If indeed your camera has the same problem as the OP's body, the cost to repair approaches that of current K-50 body-only prices. That may prove to be your best option.
Steve