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« on: May 17, 2013, 11:52:52 AM »
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First red flag for me is your saying "power savings ever 8 mins." I'm guessing that means you have Auto Power Off set to eight minutes. Canon default is one minute. The manual says, "To save battery power, the camera turns off automatically after 1 minute of non-operation. To turn on the camera again, just press the shutter button halfway."
What's the point of eight minutes? When the shutter button is pressed halfway, it's instantly on.
First thing I would do is go back to the one minute default and see if that settles the issue.
If not, I'd get a new battery -- you should have a backup anyway and it's cheaper than shipping the camera off to Canon. Charge the new battery overnight (at least that's my practice). See if it performs differently. If performance is poor with a new battery, then have Canon look at the camera.
One other thing -- you mention using different lenses in an apparently short time. Are you changing lenses with the camera on? I don't know if that's an issue, but I wouldn't do it.
I've never had a battery problem with the 5D3. It easily goes to 1000 or more shots. I keep the one-minute power off setting, and I also turn off the auto review. If I need to see a picture, I'll summon it, but I don't need to look at most of them, and I don't need that LCD powered on a lot of the time.