Some models also include the New YouTube™ for TV app. You may experience a black screen, an error message appears, or videos stop playing, when you use the New YouTube for TV app.
These symptoms are not a failure of your TV. YouTube made specification changes that cause these symptoms, which led us to decide to remove the New YouTube for TV app and its functions, starting September 30,2016.
Check the Termination of the YouTube App on Certain Televisions and Video Products article for additional information, and list of affected models.