I think this is what I am seeing too on a vero v, and mentioned here
When I press stop or a video ends I get a black screen for 2-3 seconds and it shows the source detail (hdmi) and a resolution (A 1080p)
I remember having some some similar issues with an older vero model where it displayed this info on start and stop of a video. This was controlled via settings > player > adjust display refresh rate > off
But this option I already have off on the vero v