For X100F owners, can I ask you to set your camera to manual focus mode - using the digital scale set the point of focus to 10 feet. Manual exposure at say F8 @ 1/500th. Drive mode set to L. Take a few pictures pointing the camera at various distances without moving the lens focus ring. Is the point of focus jumping around on the digital scale in the LCD or EVF.
I have have seen this happen on both the X100F and a friends X-T20. If you set the lens aperture to A mode it will hold at the set point of focus.
Cheers, Terry