I, too, own this infamous S100 frustrating canon. First purchased as a backup to my SLR, I soon found I was using it all the time. The best camera I have ever owned. (not now!) A few weeks ago I started having the same symptoms all of you on this particular forum have had. Frustrating! I have read every message on Canon’s $400 faulty camera. I had tried every suggested potential cure. I am not going to go thru the Canon fix by spending effort and money on this faulty product. That said, let me tell you what I did do that is interesting. Trying everything short of throwing the camera in a bucket of water, I flipped open the Audio Video Output flap on the right side of the camera and put my mouth tightly over the opening and blew two or three times hard into the camera. I know, moisture and all that stuff, but frustration rules!. I have not had any problems since! Each day for the last week or so I take many pictures, Turn the camera off and on continuously, Leave it in the Sun, keep it in the fridge, and abuse it in a way I would NEVER do before the failure of the shutter. This past weekend I went to a club gathering and took over 200 pictures ( all times, flash, low light, everything I could think of) I must have turned the camera off and on a jillion times. The camera worked and still works perfectly. I know, this will not continue. I do not , nor will I ever, trust this camera, however, I cannot get this camera not to work! I now use my SLR as a backup! How strange! Canon is NOT the same company!
