If your downloaded app is not working as expected, clear the app cache and data, or restart your Fire TV device.
- Press the Home button on the remote-> Settings->Applications.
- Select the Application name under Manage installed Apps.
- Clear the apps cache and data.
- Clear data will clear Apps data.
- Uninstall and reinstall the app.
- Restart your Fire TV device. Press and hold the Select and Play/Pause buttons at the same time, for 10 seconds.