I have a Roku Streambar and a Samsung Q70t tv. When I am streaming with the Streambar the audio is fine. However, when I watch a station on the tv the audio volume on the Streambar keeps going up and down. The tv is connected to the Streambar through the earc hdmi port. I have also tried using an optical audio cable and I have the same audio problem. The Streambar has the latest OS update. I have had the Stream since February. Before getting the Streambar, I was using a Roku Streaming Stick and I did not have any audio problems using the tv speakers. How can I fix this audio problem? Thanks.