I had the same thing happen with the syfy channel. Of course the wife just said "oh no, it's broken, bummer" and grabbed the remote to watch some kind of chick flick. I actually just replaced my hdmi cables thinking that was the issue. I haven't tried it yet or not, but my cables were probably 10 years old and we have a new 4k tv, so it as time regardless of fixing the issue or not. If not, I'll try a reboot too.