Greetings, I'm sorry if I am asking something that has already been answered, but I can't find it in my searches. I have a Nikon D80 with an 18-200VR lens. Starting today, about every third or forth photo fails to complete the shutter cycle (it seems to stick half way) and an error message will appear on the lcd display. If I push release and try to take a photo again, this time it will take it, but after another 3 photos or so, the same problem occurs. This is now happening with my other lens too. Any ideas what is going on? Do I need to clean anything or something, hopefully simple and cheap, like that? I have reset it in the menu. Thank you for any help or information you can give me.