My K20D just started to misbehave yesterday.
In many shots, a thick green band appears near the left border of the image (it's actually composed of many thinner bands, close together). I've attached some sample images.
I've noticed a slight tendency for the band(s) to appear only after I've taken a few shots since turning the camera on, but the behavior is quite random. Some shots are perfectly ok, others are very bad. The band pattern differs from one picture to another, but it's always near the left border of the image.
One of the pictures is a long exposure (several minutes) with the night sky. In this image, the band is purple, not green. If you look closely, you'll also see a dark band to the right of the frame.
It looks like a sensor malfunction and I'm afraid the camera will have to make a visit to the repair shop. Has anyone else had similar problems? If so, how long did your camera stay in for repairs? I really need the camera back before August 11th but I fear it'll take a lot longer to repair.
(I'm considering keeping the camera a bit longer and simply cropping out the bad areas as a temporary solution)