Did you try unplugging the soundbar from AC for 10 minutes?
If that didn't work does the remote switch the input?
You could try a factory reset
To perform a Factory Reset, Press and Hold the Bluetooth( ) and Volume Down (—) buttons for 5 seconds. Note: This will erase all settings and preferences that you have set. Enable/disable the use of a VIZIO TV remote control to power on and adjust the volume of the sound bar.