Hi there. I have had my Nikon for just over 2 years now and in the last few months the focusing has been stuffing up. I'm not sure if I maybe pressed a button or something, but it is still on auto focus and I don't think I have. The problem is that 50% chance when I go to take a picture I press down on the button to take the picture and looking through the viewfinder it suddenly focuses up and I can't press down to take a photo because it is all focused up it doesn't let me. This focusing can stay like this for minutes until I finally give up. I've tried moving it to another position then moving it back and it still does it. I took it to a camera shop and was told it was fine as it was working then, but then 5 minutes later its doing it again! It only does it 50% of the time and I haven't been able to pinpoint any pattern in scenery or lighting as to why it wont take. I'm going to London next week and I really want to find out the problem. Does anyone have any ideas what might be happening as I'm running out of ideas myself! Thank you.