Palyback stop on DSD and HD files

[JPBARIOULET]

I'm new on this forum and french (sorry for my bad english...)
This is my system; Old Synology NAS (DS109) with minimserver (starter Edition 2.0.18))> ethernet LAN > 3DLab Nano Player > Amp. > Speakers, Control with BubbleUPnP .
When I play DSD files or Flac high Resolution (from 24-96 and above), music can stop during playback. The music starts again by manually pressing the Play bar of BubbleUpnp. No WIFI connection problem
I deduced that the problem came from minimserver after several tries:
- I can play a DSD or HD file on BubbleUpnp's local library without a break
- I can play an HD file from the Diskstation library (Nas synologhy) or from my Windows PC without any cuts (also using BubbleUpnp)
Any ideas of what can be the cause of this problem?
Any help will be appreciated!
Thanks