Take two steps to always keep your Apple TV on and sync with Playlister.
Step one disable HDMI CEC
Disabling CEC completely on your television will prevent sound from being transmitted through HDMI to other devices.
- Press the Menu button.
- Navigate to down and select System or Settings.
- Navigate to down and select CEC.
- Press OK on CEC and select Off.
Step two disable SLEEP on the Apple TV
Apple TV model, go to Settings → General → Sleep After and change the delay before sleep starts from One Hour to Never.