Hi bookworm441,
Thanks for using the forums to get this issue with your TV sound looked into, I am sorry if this has been causing some frustration. I would be more than happy to look into this for you.
I understand the issue is happening whilst watching White Lines, could you give us the name of the channel it's being aired on please?
Could you also tell me if this was on Live TV or recording/On Demand?
If you could go into your box's settings to Settings > Audio & Video > Dolby Audio > Follow content to see if this resolves the issue please?
Thanks,
Megan_L