Plex does not starts automatically after restarting Synology DS214play

Hi guys,

I bought a three months ago my Synology DS214play Everything works fine , also Plex (0.9.9.7...) . 

My Synology shuts down at Night for Energy Saving but Plex does not run in the Morning when the NAS restarts. Every other app restarts automatically (Video, Audio-Station etc).

I dont know what shall i do ? Do you have oder heard any solution.

Thanks in advance.