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I have a Nikon D700 which has the same sensor as the D3 and noticed the same issue on the same target with the same exposure time and same ISO about 6 years ago!!!
I have found that this largely goes away with much longer subs but I also have a feeling it may be a part of the high ISO. I found that at ISO1600 it wasn’t as pronounced. With 60s exposures at ISO 1600 there is still SOME banding but it is largely gone.
As for why? No idea. Just worth mentioning that it is the sensor that is the culprit and not your camera alone.
I haven’t noticed anything in my much newer D7200 however.
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