I'm working on isolating if the new sensor has a banding issue or if my specific model is defective. If you have a Ricoh GRIV can you please supply two raw samples. 1 shot at a lower ISO with light and dark areas -2EV under exposed. 1 Shot at 25600 ISO in a dark environment. More is better but these two will help a lot. I appreciate everyone's help. I did look at the DP review samples and I saw no banding in those images, but I also realized it doesn't always happen with my model either. Trying it isolate conditions.