travel channel sound consistently super soft

This is the only channel - the travel channel - is super super soft. I usually have my sound at 5 - I have to turn the travel channel sound up to like 20-25!!!  Then when "local" commercials come on - you better not have fallen asleep as you will have a heart attack being woken up they are so loud.  It is only happening on the travel channel so I hope you can find a way to fix it.