Check that both earphones have battery and are connected.
If one side sounds quieter, check the fit and seal and try a different ear-tip size if needed.
Place both earphones back in the charging case, then remove them and reconnect Zohn 2.
If the issue continues, reset Zohn 2 to factory settings. See “How do I reset Zohn 2?”
If the problem continues, contact support@breggz.com.