It sounds like you are unable to reliably access and stream from the built in apps on the Apple TV. I recommend these steps from the article named:
Apple TV (2nd and 3rd generation): Troubleshooting Wi-Fi networks and connections
- Restart your Apple TV by choosing Settings > General > Restart.
- Try restarting your Wi-Fi router or modem by turning it off and then on again.
And these steps from toward the bottom of the same article if needed:
- Disconnect and rejoin your Wi-Fi network by selecting your network on the Apple TV and then choosing Forget Network. Rejoin your Wi-Fi network after it disconnects.
- Verify that your Wi-Fi router is not using security features that may restrict content or devices:
- If your router has a built-in firewall, you may need to adjust your settings to provide access to common ports used for services. For more information, see Apple TV: TCP and UDP ports and protocols.
- If you need to add the MAC address to the access list for the Wi-Fi router, the MAC address is listed as the Wi-Fi address in Settings > General > About.
- Update your Wi-Fi router to the latest firmware.
- For an AirPort Base Station, refer to this article for information about firmware updates. For third-party Wi-Fi routers, check the manufacturer's website for details on updating your firmware.
- If possible, connect using Ethernet and verify that you can play content. If you are able to successfully play content using Ethernet, verify your Apple TV is using the latest software by choosing Settings > General > Software Update.
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