I wasn't sure where to put this, but I've had my 40D since December, and the burst mode isn't working like it used to. I was at an airshow today, and I noticed it would take maybe 8 pictures before slowing down. I've tried shooting without a memory card, raw mode, small Jpeg, fresh batteries, everything... and it's still slowing down. Not only that, but I take a few pictures really fast, and it's like it's not writing fast enough or something. Has anyone heard of this, or do you have any ideas to what may be wrong??