Library stops syncing

Hi there,

syncing not working for me anymore.
It stops every time exactly at a file size of the database file of 3 GB.
I have removed the last music titles of the syncing, but the has no effect.
Has anyone an idea?

regards Uwe

Audirvana Mac Version 3.5.26 (3556)
macOS 10.13.6 with 16384MB RAM