How is your sound bar connected (Guessing optical) and im assuming to the TV directly?
Did it just stop playing during listening? There's an option toggle button on the bar that toggles between inputs optical/Aux/Bluetooth and also a source button on the remote.
Check the sound bar is on the correct input (could have been changed accidentally) and check the audio connections at both ends, and audio is not muted/has volume on both Sound bar and TV.
[video="https

/www.youtube.com/watch?v=YqT6G5pYE9M"][/video]
Try another optical cable and also headphones out from the TV to Aux input on Soundbar.