I sync my PC-based music/playlists to a WD NAS and have done so for many years. Recently, I noticed that the sync was claiming success but it hadn't processed all of my playlists. They are ordered simply A to Z and consist of 19,900 files or thereabouts. For some reason, the sync is 'completing' in the middle of the playlists beginning with 'S'.
I sync the music to the same drive and the files beyond 'S' appear to get copied fine - so why isn't the playlist sync doing the full A-to-Z? There is plenty of space on the NAS so I'm a bit baffled why it's suddenly started misbehaving after all these years.