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How can I fix the sound on digital channels?

I have a Panasonic DVD recorder DMR-EZ45VEBS. It is 4 years old. Over the last year the sound on the digital channels has become more and more distorted and echoey, until now I can only watch analogue.
Can anyone give me a clue as to why this happens and how to fix it please?
Pat, October 2010
link Click here to see other fixes for Panasonic DMR-EZ45VEBS.