Have a panasonic blu ray dmp bd655. all of a sudden the sound is all messed up. Regardless of what DVD we put in the voices vibrate. if we play it at fast forward they sound like the chipmunks but no vibration. Picture is fine. Bought a cleaner and when you put that in the voice on the tutorial is fine. But put in a video (dvd or blu ray) and it sounds like a vibrator on a larynx. We've had it about a year and have watched maybe 15 dvd's.