hlmichel wrote:
I have seen this before from my Z10, but never from my D3000. The picture was taken at iso 200, 1/60 F4.5 I think.
I had my flash mounted and was aiming at a light part of the wall close to the ceiling.
Look at the woman to the left. There are redish stripes running up her dress and the shot was very noisy. Other shots were taken in the same conditons only moments before and after--in the same spot. But they were fine.
The only time I have experienced this was when I had the camera on for too long. As the sensors temperature continue to rise, I began to notice noise and banding across the dark portions of my images. I don't know if that is what you are experiencing but it might be something for you to consider.
Hope you find out what is causing this...