Here are some things to try:
Test your connection speed
If content buffers or is poor quality, a slow or inconsistent network connection might be the cause.
Download an Internet speed test app from the Apple App Store and test your connection speed (or test your download speed on a computer connected to the same network as your Apple TV. To do this, open a browser and search for 'Internet speed test').
To stream HD Video, you need a minimum download speed of 5 Mbps. For more help, see CNN buffers or pauses.
Update the CNN app
Make sure you have the latest version of CNN. To do this, go to the App store and search for CNN. If there's an app update available, choose Update.
Restart your devices
Delete and reinstall CNN
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