I get the same thing, but mine is more of a shadow line and not as sharp as yours. The line moves when I change shutter speed as well. I am thinking of contacting Panasonic about it and see if it's defective? Hopefully we can find a solution as it has ruined a few shots!
Hello everyone, I figured since this was on the subject of banding, I would post here rather than starting a new thread. As you can see in the picture, I have a dark line that travels along the bottom third of my shot. The line seems to move at different iso's from the bottom, to top, to middle...