The sound is very quiet about 3 times quieter than normal. NFL game day morning is the show I was watching.
Also reported on the Sky Community Forum by a Sky customer.
So I am assuming it's the feed from the NFL Broadcaster and not hardware related.
I agree with you. It is Sky’s broadcast not hardware related. I can tell you it is not the feed as it is find on the NFL network channel
Report it to Sky using the email from this Sky Community thread on the subject matter.