This may be not related. Also on D700 with 35-70 f/2.8 lens I had similar symptoms. It turned out that I would turn the aperture ring on the lens by accident from the smallest f/22 position. The camera would no longer snap the picture and display EE on the top screen. Once the aperture ring is back the camera is back in action.
I don't know how your lens works, but if it has an aperture ring maybe you turn it ever so slightly when you put it on and take it off?