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

Streambar works with Roku channels and not FIOS

HI... I have an HDMI cable from my Fios box into a Sony Bravia TV.  I have an HDMI Cable from the HDMI ARC into the Streambar.  When I launch Roku the sound comes out of the soundbar just fine.  When I change input to FIOS I hear sound through the sound bar until I change the channel.  When I change channel the sound doesn't work any longer  I have to change the audio setting on the Sony from Audio System to TV Speaker and can't hear anything out of the soundbar.   I thought I'd be able to use the sound bar full-time.  Thoughts? thank you!