Hibernate of TV Backend blocked by Raspberry Pi2

Hallo OSMC Friends,
I have a TV Backend running with DVBViewer Recording Service as Server. 3 TV Clients --> one Windows x86 PC with DVBViewer Frontend and two Raspberry PI´s with OSMC.
This Server normally goes in hibernate/standby if it is not in use for about 5 minutes. But if one of my PI´s is still working/idle without any TV play, the server doesn´t shut down in hibernate/standby. I´ve enabled the Power Save Mode in TV Settings (OSMC) and raised the EPG update up from 3h to a 24h period. What can I still do to get my server in hibernate/standby while PI is idle or plays Internet Radio?

Kind regards

Isn’t anybody here who is able to help me?