When I reduce the sound via the external sound control and hold it down for more than 1/2 second it will go from full sound to zero sound. To reduce it one step at a time I have to mash the button one mash at a time. Is this normal? I bought it at Best Buy and they would probably make me return to Apple and I'd be without it till Apple sent it back. I can live with it the way it is. Just wondering if anyone else has had this problem.