It's a bad thing. It started last night. I was shooting the Rutgers Soup Bowl for the paper on campus. I had with me my 30D, 35-350 f/3.5-5.6, 200mm f/2.8, and 17-85 f/4-5.6. I started with the 350 while the light was good. About 10 shots in, I get Error 99's. I figure it was the lens contacts or somethings so i played with removing/mounting the lens, but to no avail. I switched to the 200, got the same thing, and decided it was a camera problem. I then proceeded to restore the factory settings - didn't work. I decided to try a sensor clean which surprisingly seemed to have done the trick. I began shooting away. During the game, I noticed (while chimping :blushing that my exposures were slightly brighter than normal and weren't consistent despite using the same exact settings. I brushed it off. This morning, I was playing around with the 17-85 in my house. I shot two shots. Both of them were at ISO3200 f/4 1/6. One is slightly underexposed and the other is uselessly overexposed. Is my shutter dying? I bought the camera refurbished from B&H earlier this year (summer). Please help. This is my only camera and I need it for my newspaper work as well as enjoyment. Sorry for the long post and thanks for any help.