Every so often a shot comes out with these uniform horizontal lines on it. Always top and bottom in this exact position and always only two.
Looks like a shutter problem but it's happening no more than 4 frames out of every 36. I've gone through all the speeds with the lens off and nothing looks out of the ordinary but it happens at fast and a slow shutter speeds.. so any clues?
Ps the black bit at the right is just a particularly sloppy scan, my bad.