Are recordings from BBC1-HD also affected, or is it only the live channel?
How is your audio routed - is it "plain" HDMI lead to your Samsung, or are any optical connections and/or A/V amps involved in the chain? I don't have a Samsung TV, but if you can provide the model number - others may have experience.
For elimination purposes, try toggling the PCM/Stereo option under Home > Help & Settings > Settings > Audio > Dolby
I'm a Very Insightful Person, I'm here to share knowledge, I don't work for Virgin Media. Learn more
Have I helped? Click Mark as Helpful Answer or use Kudos to say thanks