The output of my slingbox 500 HDMI connection causes the video to intermittently flash on the TV screen. The audio also drops down at the same time. . Sometimes the video and audio completely dropout leaving a black screen and no audio for 10 or 15 seconds and then it goes back to normal for awhile. The sequence of these events are intermittent. I took the output of my AT&T cable box and disconnected it from the slingbox and put it directly into the TV HDMI input and there were no problems. No video flashes and no audio drops The componet output of the slingbox works ok on the TV input. I tried re-booting the slingbox but it did not help. This is very irritating. I bought the latest 4K Ultra HD TV and now this is happening. What is going on?