I've never had any trouble with my D600 bought in 2013. It still has the original battery which lasts weeks if not months when not used regularly. I always turn the camera off when not in use. It still has the original shutter too. The sensor did need cleaning (which I did myself) but only after more than a year of use. There were some stubborn spots which required several cleans before they were gone. I haven't cleaned it again since - I guess I should check but I haven't notices spots on my pictures...
