Using the AF-C and AF ON method is no solution for D800.

The only time I use AF-C is when I'm tracking moving targets; that is what Servo mode is for.

And furthermore, I HOLD the AF-ON so that focus tracking occurs with the moving target.  I only use AF-S with static targets.

When I do hold AF-ON in AF-C with Auto, 3d Tracking, 9, or 51 point, my focus points move to track the target.  Sometimes I do not want this to happen, so I switch back to AF-S.