I have answered this before. It is not your television that has this problem. What you describe is a common occurrence for any and all TVs. The provider networks do not seem to have audio balances, that provide for virtual sound. We are talking about the paid services you get from Net Flex and the like.
Satellite and Cable are usually consistent. There is only one manufacturer of TVs that provides a fairly good chance to defeat this. If you look at my earlier posts you will see my answers. A sound bar will not correct the problem. So…..be happy your TV is fine. Thanks for listening, Matt of Martins TV Repair.