Looking back on each day it looks like between 10 and 11 pm is what it stops.
So as it gets darker tehe picture goes to black and what, then from 1045 ish (snapshot it every hour, I have upped to every 3 minutes now) the picture is black with a few dots for solar lights I have in the garden.
Its like it doesn’t feel the Infra need to be on, yet when I bring the camera inside and put in a cupboard the infra comes straight on