Interesting, I also have this same issue, started around 12months after i got it, I call it a glitch, sometimes doesn't happen at all, other times screen goes black, multi coloured etc, and then comes back, lasts 1sec max. They took it in for repair, replaced the entire mainboard, couldn't replicate issues their end, still does it here. Just said it was some kind of incompatibility on my dinosaur TV, odd as it worked fine to start with, and the TV with my TV recorder box directly connected worked without issue. I guess it could be firmware related, but i just live with it, doesn't both me too much.