Minimserver in Docker Container Keeps Writing To Disk

[MarcGPV]

Thanks SimonCN for the info and help.
But actually I did not explain my problem correctly (sorry, my mistake...):
I migrated from my old Synology NAS (DSM 6.x) to a new one (DS224+, running under DSM 7.2).
On the new NAS I had MinimServer already running as native Synology app, not containerized, and this works well: the NAS goes into sleep after the defined time of non-activity.
I'm now also using BubbleUpnp-server to emulate OpenHome-protocol to reach my network-players via the Lumin-app, but BubbleUpnp can only run in a container under DSM 7.x. This is also working nicely, but now my NAS stays always "on", even if no activity whatsoever.
So, in my observation, it looks like BubbleUpnpserver (or it's collaboration with Minimserver?) is causing the read/write NAS-activity every 30 seconds.
I added the -XX:-UsePerfData option on the java command for BubbleUpnp via a slight change on your recommended instruction but it does not give any different behaviour, and nothing visible in the BubbleUpnp-log neither.
I guess I need to reach out to the BubbleUpnp-community, unless somebody following this thread has experienced the same... and found a solution...?