Roon is adding, scanning and identifiing over and over again

hello
i have the core setup with headless mac mini (10.11.6 el captain)-remote via iphone or macbook

  • connected to a synology ds212 over ethernet
  • files of all kinds on the synology (cover,pdf, still ape ( i know this will not work at the moment) dsf,flac, mp3 and so on
  • setup as smb

the problem is roon is running the innitial scanning, adding and identifiing over and over again and never gets ready and always looses what the programm already found?
plz help

stephan