I have a pair of 15inch active Dixon speakers. This system is quite old but nevertheless it works good until a few days ago. I played a song with a lower bass note and i put the volume slightly pass halfway and the sound cut off. The system didn't come back on again. I checked the fuses and they were fine. None were burnt. Also took it to some guys but they say that it comes on for an hour then cuts off again. What can this be?