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Best to verify the network

Check speedtest to see current internet connection

To see a current status of the local network run a report on your computer using istumbler, netstumbler or similar. Look for signal strength, noise, nearby networks

If on wifi try ethernet

Please unplug it from it's power source for 2-3 minutes and then plug in and re-test. If you need further assistant please start with Identify your Apple TV model so we know what we are working with.