PlexMediaServer not starting on DS416j

I had PlexMediaServer-1.5.5.3634-995f1dead-arm78.spk running on my Synology DS416j.
It is not responding, even after the service has been stopped, updated to PlexMediaServer-1.5.7.4016-25d94bad9-arm7.spk and restarted.

The protocoll shows a lot of traffic from another night ... where I was not active ...
And can not find a file it is looking for powering up...