Multiple synchronize requests needed

Hi,
I’am using Infuse 8.1.5147 on iPhone and other devices and noticed that several manual synchronizations (full complete spinning wheel of the the sync icon) is needed to reflect changes from the library.

  • Library is on Nas connected via SMB
  • Synchronization via iCloud is activated
  • Background update on iPad and iPhone is disabled to save battery

It’s a little annoyance but is there any suggestion in settings to have a more reliable behavior ?