Sound issues with Apple TV 4K

Looking for help. I am using the xfinity stream app on my Apple TV 4K box and the sound constantly drops off. It's random and becoming more frequent. I've tested a firestick and android box and it's not a problem. However, on the Apple TV 4K box, it's persistant. I have contacted Apple and there is nothing wrong with the hardware and is an app software issue. Can you please help? This is getting quite frustrating.