network unavailable-reload unsuccessful--other channels workinf

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For a misbehaving Apple TV app on your Samsung smart TV, consider these troubleshooting steps from Samsung Support: What to do if an app is not working on Samsung TV - Samsung Support

1. Cold reboot the TV,
2. Update the TV system software, if available,
3. Delete and reinstall the misbehaving app (if deletion is supported for that app),
4. Reset the ‘Smart Hub’ (like a factory reset for the apps part of the TV).

If you need further assistance after that, please contact Apple Support.

If this is relation to a specific app then you can try force quitting, and then reinstalling (contacting the developer if the issue persists). If that isn't the issue then you will need to elaborate.