I have Klipsch right/left/center front speakers,same for mid room, then rear bookcase Klipsch right/left and a subwoofer up front. I usually listen all channels because its louder. I don't like the settings when it works out of front one too much. All of the sudden the left side stopped worked in that mode. They do work in any other setting just not all channels.No wires are loose due to they work other times. Any suggestions on these not working?