HDMI has a "handshake" it makes when it hooks up. Sometimes the handshake don't get made and you have to try again. I have a soundbar and loose sound sometimes with the mag. I just power cycle the soundbar and force it to handshake again and sound returns. That said, I always have sound on the tv. So in my case the tv is not shaking hands with the soundbar thus loosing sound. When I loose sound it is when I change channels on the mag. Just wanted to toss that out there for general knowledge. Have a great day! 