Hello John,
I found this article - not sure if it relates to your problem but it could be a noise pattern caused by the camera running too warm? I think you have to cool the camera - or some other stories I read said that the lines disappear once you subtract darks?
I don't have one of these cameras - I just looked it up out of interest.
http://www.stark-labs.com/craig/reso...Review_API.pdf
Regards,
Tony.