Wow, I never noticed it until I saw this thread and then I listened for it - and sure enough the first commercial I hear it sounded like at points the sound track was slowing down - like if you were listening to an old LP and point your finger on the turn table to slow it down periodically. Is this just on Fox or is it happening on other networks? By the way I use Dish Network.
I've noticed it in other digital HD channels as well. I'm on cable HD.