We have 2 TV sets with Chorus digital. In our main room we have no problems.
In the second room every now and again the audio drops gradually until it is muted.
Initially we thought it was a problem with the TV but restarting the Chorus box normally restores the sound
We then gave the TV to a friend who has used it for 3 weeks without an issue.
Nope, sorry. The only audio issue with my digital is on channel4. I have a 5.1 system, but when watching C4, the sound comes from my left front & rear!!!