The ?input volume? to the transmitter/ base unit is set too low. Within a certain short time this activates the automatic switch-offfunction. The input volume must be set at a proper fixed level: Turn up the volume of your music source to the highest acceptable undistorted level. if possible, always connect to an adjustable audio output (usually any headphone output jack). In case of a HiFi stereo, set the main volume knob at a higher fixed position. In case of certain TV?s, the headphone jack output level can only be adjusted after accessing the TV on-screen menu. Note: Adjusting the listening level should be done at the headphone itself only.