I am sad to see people having issues with service for their D600. I had the spotting issue on my D600 and sent it back to Nikon USA in NY back at the beginning of June. They had the camera back to me in less than 2 weeks with a complete cleaning and also they replaced the shutter mechanism. No issues yet. Best camera I have ever owned. Glad I sent it back and very happy with the results. They did a bang up job.....Thanks Nikon.