Well, lately, while using my Canon EF 100-300mm F4.5/5.6 USM lens, sometimes after a while of use the light meter will get stuck one notch above the center position in any of the modes except 'M'. It is getting really irritating, and I dont know if it is the body that is defective, or possibly the lens. It only happens after several hundred pictures are run through the camera. The only way I have found to fix it was actually reset the camera using the 'clear all camera settings' in the menu. I then lose all my custom parameters, and custom functions. Anyone have any experience with this problem, or have a fix?