5D Mark 3 Shutter Release or Self-Timer Mystery

My 5D Mk 3 is only three months old. The last few times I've shot with it, the shutter has demonstrated a mind of its own. I'll be walking with it on the tripod or have it hanging on the Spider Holster and I hear it taking photos!
As embarrassing as it might be, I'm hoping that it's just my own ignorance with the camera and not a real problem. Maybe I have a setting somewhere causing it.
I have it on Single Shot and was using the 2-second timer. There's no bracketing set.
Has anyone had this problem or have any ideas what might be causing it?
Wednesday I took about 60 shots of which five of them were of the sky, taken by the camera while I was walking around with it on the tripod, and one of a crooked landscape while it was hanging on the Spider Holster.
Today, I took 33 shots of which four of them were taken by the camera while it was hanging from my Spider Holster, just seconds apart.
It doesn't start doing it right off the bat.  Today I shot 19 photos before it started.
Any suggestions appreciated!
Bev

Bev,
As an experiment... you may want to test the camera by putting it into "AI Servo" or switch the lens to "MF" mode... and leaving it on for a bit (alter the auto sleep to a longer duration such as 30 minutes).  You don't have to watch it... just note how many frames it has taken (or put in an empty memory card) and then return to see if it has taken shots while you were away.
In "One Shot" mode, the camera will normally insist that it can lock focus before taking an exposure.  It's possible you have a flakey shutter button which is grounding contacts ... making the camera believe that you've pressed the shutter even when you haven't.  If this happens more often than you realize, but the lens cap is on and/or the camera didn't have enough light to lock focus, then you wouldn't necessarily even know it occurred because the camera would not have taken a photo (due to inability to confirm focus lock before shooting.)  But in AI Servo mode or with the lens in manufal focus (MF), the camera will take a photo whenever the camera believes the shutter was pressed completely and it would take the shot immediately. 
I would probably test the camera for a while with the self-timer / remote sensor mode DISABLED... as well as doing this for a while with self-timer / remote sensor ENABLED in an effort to establish a pattern.
With all the cameras I've had, I have never had a camera spontaneously take an exposure that I didn't trigger.
Tim Campbell
5D II, 5D III, 60Da

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