It happened a couple of times that serious distorted noise came from my front and rear speakers when I played a CD. After I switched "Mode" and switched back the previous mode, the noise is gone. Also, when it happened, I also tried to "stop" players and "play" again, the noise disappeared. Could anyone know what reasons cause this noise?

By the way, here is my system:
1. Sony DVP-NS900V SACD/DVD/CD player
2. Outlaw 1050 Reveiver
3. Atlantic Technologies, T70 six (6) speaker package.
4. 51" Panasonic HDTV ready monitor.