If the Sound Bar power turns off automatically after a certain amount of time, the Auto Standby function may be activated. With this function activating, the Sound Bar enters standby mode automatically when you do not operate the Sound Bar while no signal is input for about 15 minutes (or 20 minutes). This specification aims to cutting down the power consumption of the device. This may also happen when the sound level is too low.Depending on the model which has the Auto Standby function, you can turn the function off. Refer to the product manual to see if your Sound Bar has the Auto Standby function, or to see if you can turn the function off.