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Banding in the same places is also consistent with my theory.
If a noise is generated by processor (and gets somehow into analogue circuitry), it has to be in sync with line/frame reading.
It is possible to get rid of it by careful design, but then those cameras would have been much more expensive (and astro cameras actually are..)
Remember, all those DSLR's are NOT astro cameras. In normal, everyday photography, in most cases banding is not obvious, and when it becomes obvious, then it is caused by faulty component (power supply filtering for example or something similar).
So, yes, I agree with Peter, this camera is most probably faulty and needs repair.
My 400D also shows banding, but on individual shots only, and only when images are stretched to the extreme. Stacking removes the problem completely.
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