Can you see the blades "jamming", or you assuming they are malfunctioning? Try rubbing a pencil eraser over the connections on the lens, then reattach the lens to the camera and give it another try. It may just be a bad connection between the camera and the lens. If it still malfunctions, then it's time to send it to Nikon. Will the dealer you purchased the camera from take care of that for you?

Bob