I just started having issues with my fader controls. I usually use 13-14 channel for my main CD music in stereo. Once I set the fader to the desired volume it will play fine for about ten minutes or so then the music sound mono with no bass. When it does this I can regain proper stereo sound as it was originally by racking the fader back and fourth quickly. It will repeat itself as described above every 10 minutes or so. I switched over to 11-12 in which I'm receiving the same results as 13-14. Would dust/dirt in the fader control cause this? If this is the case or if there may be another cause could you please let me know what to check for? I would sincerely appreciate any help that you could give. Thank you, Ray