Whenever I am watching TV from a Cable Box. The sound seems fine then it will get quieter or louder then back to it being fine again. I know you use to be able to fix the Audio under Settings. But it Seems like over the past few Software Updates they took that option away. It only tells you how to fix Audio issues in Roku Channels not when just watching TV. It happens when watching shows just in in commercial. My HDMI ARC is broken so I have to use HDMI and optical cable.