I have had an Apple TV for years. I am currently running the 4K model. I have experienced very few problems with the Apple TV that a simple Restart of the Device would not fix. However, that is not the case with many other people. One frequently reported issue is no WiFi connection. If you are having this issue or any issue with your Apple TV, then read this article. It is geared toward fixing WiFi issues, but has some good steps for general Apple TV troubleshooting.