Please check the following
- Player is assigned to a Group, Group has been assigned with a playlist and playlist has assets to play. Also make sure those assets are not deleted.
- Weblink assigned has no CORS restrictions, otherwise use "webpage" link type to add those links Under ADD assets button.
- Protected youtube links and Youtube playlists may not play all the time
- SD card in the player is full, reduce the number of assets and re-deploy (you can check the SD card usage by using "df -h" command under piShell or ssh terminal)