@YouTubeTV Found an issue on your iOS app: If captions are on and you cast via Airplay, the captions appear on the iOS device and not on the casted screen. Using an iPhone X using Airplay on Apple TV 4. Figured I’d pass that along 
We'd like to help. Have you tried uninstalling the app, restarting the device and reinstalling the app? Let us know if that works!
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Tried that. Still shows up on device and not the casted screen. Airplay has some issues. Randomly the stream will drop, exit to the Apple TV home screen and then start up again.
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Thanks for letting us know. Our live support team can help with this, you can start a live chat or request a callback from here: https://goo.gl/Bq8kYE . Hope this helps!
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