Are there any particular series/episodes of these programmes that you're having issues with? If you can be specific - one of us can check, try to replicate, and most likely advise.
Which TV package are you on, as this may make a difference - can you watch the Sky Comedy channel in SD (Ch122) & HD (Ch121)?
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