Playback Issues - Audio/Video & Power

Help with audio & video playback issues, TV display type recognition & compatibility, HDCP messages, troubleshooting playback errors, advertisements, and resolving power issues.
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Level 7

ROKU spontaneously lowers volume to 0.

We have a 1 year old ROKU Ultra.  Starting today (June 29) the volume on the Samsung television conntcted to it spontaneously lowers to zero (0).  At times, no volume indicator appears when I pust the volumn button.  At other times it appears, the volumn starts to increase but then "dives."  Still other times, it will work normally for a few minutes and then go down to 0.  The other day there was a significant audio/video sync issue but it resolved itself.

I have rebooted the TV and the ROKU; switched the batteries, disconnected all cable and power and reset the Roku box.  I can find no support for this issue on the Internet.

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