Woburn 1: The Musik plays a view Minutes. Than a soft slow, cracking Sound starts. The cracking Sound gets faster and louder. After a view Seconds you can´t hear anything. No Musik. No Cracking. Than the Musik continues to play. In irregular Intervalls of a view Minutes the Cracking starts again. Even if no Musik play the cracking starts after some Minutes, gets faster and louder ... I would like to fix the Problem at home, but I need help.