MY SPEAKER FREEZES RECURRENTLY SO THAT EVEN THOUGH THE VOLUME IS INCREASED OR DDECREASED THERE IS NO RESPONSE.EVEN AFTER PUTTING IT OFF FOR SOMETIME AS THE MANUAL DIRECTS THE FREEZING IS STILL PRESENT, THIS COUPLED WITH THE FACT THAT SOMETIMES ALL THE FOUR LEDS ON THE CONTROL PANEL (SPEAKER)COME ON AT ONCE(FREEZE) .THIS IS NOT NORMALLY THE CASE.I WILL BE GLAD TO BE DIRECTED AS TO WHAT TIO DO.THANKS.