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someone told me about this today...
either you haven't used your 5d3 in awhile, or you just get it back from the center, or you just finish upgrading firmware for your 5d3,
sometimes its MA changes to -8...
so when you go out for shooting,
make sure you go to setting and check your MA,
just to make sure your 5d3's MA isn't -8.
he said it can be some kind of software problem, and hopefully canon will recognize it soon
and fix this software issue.
if you do not have this issue, that's good, but if you do,
just to make sure to change it, otherwise you will have whole bunch of pictures that are out of focus.