Samsung Home Theatre sound problem

I have a new Samsung Home Theatre Blue-Ray system, Model HT-C5500. Recently one or more of my surround sound speakers will cut out, sometimes one and sometimes another. It doesn't seem to have anything to do with whether I'm watching a recorded TV program, a DVD or live TV. After a couple of minutes, the sound comes back to normal. I discovered that if I turn up the volume, the sound pops back. Any ideas about what could cause this problem would be appreciated.