Was shooting my Canon 24-105...my favorite walk around go-to today on an upland hunt and it suddenly quit focusing and locked the body up giving me an Err 01 notice. I could shut the camera down, replace the battery, etc and it would initially act like it was going to work only to find it would shoot one or two shots and then lock up again. I Pulled the lens off and took a clean micro fiber cloth and rubbed the heck out of the contacts with no luck. Not initially knowing what Err 01 was, I figured it was the body. Luckily someone in the gang had a little Rebel in their truck they weren't using so I pulled the lens and put it on their body. Within a few shots, it gave me the same Err, but it said what it was on the back LCD..."bad contact connections with the body and lens, clean the lens contacts". Well I tried that again with no luck. So now I'm at home and I clean the contacts with a bit of ethyl alcohol on a micro fiber cloth...and again initially the lens worked for a few quick bursts and then it just quit focusing and firing. I can hear the IS working in it, but it doesn't focus. So I guess it is time to send the lens back to Canon for cleaning and checking out. Anyone else have similar issues and what was the fix?