09-09-2015 06:56 PM
09-10-2015 08:46 AM
09-10-2015 09:48 AM
It could be a battery issue if, for example, the autofocus motor has to wait for a weak battery to achieve the minimum necessary voltage. And the fact that it also happens in manual mode may not necessarily be inconsistent with that explanation. As one of the regulars (Ernie Biggs?) pointed out recently, some of Canon's recent lenses are fully electric, with even their manual focusing rings being nothing but a motion sensor.
03/26/2024: New firmware updates are available.
EOS 1DX Mark III - Version 1.9.0
12/05/2023: New firmware updates are available.
EOS R6 Mark II - Version 1.3.0
07/31/2023: New firmware updates are available.
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