I am not sure I am missing a setting somewhere, but my 6D MKII (bought new in November '17) seems to be forgetting settings during stand-by.
For example, I set up the AF to single point, drive mode to high-speed. If I let the camera sleep after some time of inactivity, the settings change to AF: Zone and drive to single shot once the camera is woken up by pressing a button.
Is there a setting I have missed that says reset these parameters after sleep? I see there are settings to reset certain functions (like HDR and bracketing) after turning the camera off but those are disabled.