I have a Roku Ultra (4670 series) player connected to a samsung sound bar via ARC HDMI connection. From the sound bar, the output goes via HDMI high speed cable to the 4K TV HDMI connection. The signal keeps getting lost, screen goes green or black and comes back. I do have High speed HDMI 2.0 cables. Anyone know if the 4670 is compatible with ARC or know why the signal/connection loss