You may have one or more of the following problems: * The Internet connection of your PC breaks down or is interrupted * There is a problem with the sound from the rear speakers of the device * Other wireless equipment problems occur 1. Press and hold the SOUND key on the remote control for 5 seconds. The device will switch to another channel for the connection between the DVD unit and the rear speakers. Note that the channel numbers (CH0 - CH2) in the display of the DVD unit start flashing. 2. Switch to another channel on the other wireless device. Refer to the user's manual of the device. 3. Try different channel combinations on both devices.