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

Sound Goes Out When Switching Apps

I have a Roku Stick + and Vizio TV. I bought my Roku a year ago and it has worked fine until my last system update to version 9.4.0 Build 4190. Now when I am watching Netflix and switch over to the Amazon Prime app, the sound goes out. It also happened when switching to You Tube.

If I restart my TV, the sound comes back on but I need a permanent fix. I have also done a Roku system restart and that worked temporarily as well. 

I have checked my channels and they are all updated. This problem is still occurring. 

Thanks for any help!

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