Exactly - if you think about the automatic dead/hot pixel removal, the camera is going to assume these errors are always in the same location on the image, and

Exactly - if you think about the automatic dead/hot pixel removal, the camera is going to assume these errors are always in the same location on the image, and maintain a mapping of where they are. If instead in space these errors are caused by cosmic rays and can affect any part of the image randomly, and for a limited time only, then this requires a different algorithm, otherwise the camera will eventually be painting out the entire image as different areas get affected. That all said, I know nothing of the details of these camera firmwares, and they may be doing other things instead. But, I suspect it is not as simple as some comments in this thread suggest... because nothing ever is.