I have had my Sony 930 for a year now without problems. Today I was playing Chicken-Run in DTS when the word "PROTECTOR" appeared flashing on the display, during the first minute of the disc when the dog starts barking. All sound was cut and the amp did not respond to anything but power-off. I had the volume at about 3. That's 11-o'clock not 3 o'clock, so not very loud at all. Any idea what is going on here. There is no mention of such errors/warnings in the manual. Playing from Sony-725. TIA Mike.