I am having a difficult problem getting the sky to render cleanly for a short animation I am doing. A series of bands appears in the sky when rendered. They are not especially apparent in a still unless rendered in final or ultra but show up extremely well in animation. The attached render was done at ultra resolution to help show this, I blew up the inset and cranked up the contrast to help show the bands. When rendered in an animation the sky seems to have horizontal bands traveling up. Any ideas/suggestions on how to eliminate these would be greatly appreciated. I can also throw in a free burrito for the first one with a fix for this.