I went through the same thing back in 2000? I think that's when the perfect's first came out. Anyway's I bought one, had a problem and called infinity. They shipped me a new one and paid to pick up the old one. That one lasted a few weeks then started acting like what you described cuttin in and out. I called again and talked with Chris Dragon?? one of the designers and he came to the same conclusion that it was a voice coil problem. But they were cool about it and sent out another one. Somehow they shipped more than they should have to me and in the end I had 2 kappa perfects but I'd only paid for one.