I was playing my DUO earlier, and the sound got really low, and then faded out. I can still get some sound through the headphone jack, but its low. Has the DUO overheated? I just got the sound repaired, but the DUO smells like hot plastic, so I'm wondering if thats what happened. Or is it just the Audio/Video cables? I really don't want to send the system back if I don't have to.