Phillip Lynch

USB EF Lens focus point change dock-
is that possible would like to hear from the techie people here and is possible for Canon to put an extra card slot in the battery grip.

There is no other camera or optical company that can design and output lens in quantity and quality like Canon a new mount design they can do quietly, remember that special wish lens that they did ...

Quoting Canon"Glass First"

For the DJI Mavic Pro all versions,DJI Mavic Air and the Parrot Anafi I would recommend the Lowepro Photo Traveler 150 -a compact but versatile camera backpack.

I think the Canon 5DIII was the last make canon with a removable button cell backup battery, all the newer cameras its built in.

I would like to hear the cause and solution

I am no expert, but I can guess that since the battery and camera is new a few things may be happening at the same time. 1. The camera's internal battery(super IC) is being fully charged ie first ...

Just a wild guess but your memory card may be slow.

There is a new firmware 135 for 5DIII as well .

Well said and I too have come to the same conclusion the colour(color) bias is in the optics and Canon have moved ahead with better overall optics.

what was your shooting settings RAW or jpg

This was my first digital camera, did plenty of work with it and it did video too LOL.