I just observed a quirk and wondered if this was a SONOS or NAS issue.
I noticed that many of my albums had duplicate entries in the Album view and it seems that SONOS is cataloguing everything in the NAS recycle bin?
I had been converting all my WAV compilation albums to FLAC and had a large volume of wav files in the recycle bin otherwise I wouldn’t have noticed it,
It’s an ASUSTOR Flashstor 6.
The problem was cleared when I emptied the recycle bin but its an unwelcome extra step if I have to check & empty my recycle bins before updating the media library.