SonyA580 wrote:
Recent articles indicate Nikon has altered their camera software to deliberately preclude the use of Sigma lenses on some Nikon bodies. I don't know which models are affected, or if other third party lenses are included in the design change, but Nikon/Sigma users, and the photo community in general, are pretty upset about the whole thing.
Not the problem as already stated the problem is "occasional". The OP stated that the photos before and after the blank or black one is fine.