Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
I believe I have figured it out, it could only be a temporary fix but when I hit the "*" key and change the volume mode to "off" instead of "leveling" or "night", it brought the sound back to the YouTube app. Hopefully this helps
So the * trick worked for me , but got tired of doing it over and over so I stumbled over this fix, if you hit * and on Volume Mode turn it off, the youtube home screen is wobbly sounds but the videos start with sound no problem now.
YO PEOPLE! I JUST FIXED IT! GO TO SETTINGS AND TURN THE VOLUME MODE TO OFF AND SHOULD COME RIGHT ON. LET ME KNOW IF IT WORKS FOR YOU.
I posted the workaround using the pause video, press * * unpause video workaround. I like Lions solution better as her/his workaround is persistent and you don't have to do the process for each video. The steps I used for Lions workaround were: pause video, press * on remote, scroll down to "Volume mode" and select Off. Thanks for your support all and special thanks to Lion.