So that is a 4k TV. However HDCP 1 is also the input that the V6 should be connected to in order to avoid problems usually.
What HDMI cable are you using? It needs to be at least the High Speed HDMI standard or better.
The behaviour you're seeing is usually when there is a problem with the newer HDCP 2.2 standard.
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I work for Virgin Media - but all opinions posted here are my own