Does it never have sound on the second tuner? We sometimes lose sound on the second tuner if it starts recording on the same channel as the first tuner. It could be that the first tuner loses the audio when the second starts recording, I can't quite remember.
My wife 'fixes' it by overriding the automatic extension to ensure that the first program stops recording when the second recording starts. It also frees up the second tuner to record an overlapping show on another channel.
You have to remember not to delete the second show until you have watched the end of the first show though.
A real pain that should have been sorted a long time ago.
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