Hi fellow CSers. Pls advise if something is wrong with my lens. Occasionally the message comes on 'lens not attached' when powering up. After twisting the lens, everything comes back to normal. The lens is attached on a D40X. I have tried cleaning the contacts but it still happens. I was wondering if any 18-135 users are having this problem or is this something wrong with the circuitry. Would like to thank those who respond in advance. Best regards.