My first post here...
I was doing a location shoot on the weekend, my first day out with my 5d Mk III; since it was an office location, I decided to test out the Silent Shutter Mode. It worked well, and was quiet enough that a few people in the office asked if I was actually taking photos.
The problem I noticed, was that every few minutes of shooting, the camera would lock-up. However, everything seemed to work, except the main shutter button. Even after powering the camera off, and powering it back on, it would not fire. I had to pop the battery out each time in order to rest the camera and regain functionality.
I've replicated the error on both 'Auto' mode, as well as manual modes, using the Canon 24-70mm lens, and 430ex flash. It seemed to happen about once every 20-50 shots.
Anyone else notice this problem, or able to replicate it?