Roon "losing" albums

I am running Roon 1.5 on Mac mini (2012), Music files are on a Synology NAS via Ethernet; Roon indexed everything just fine, however, recently Roon apparently lost almost 3000 albums. They usually come back via “restore” of a backup, but I guess this is not how it is supposed to work?

Thanks for reaching out, @Christian_Fingerhut!

So we can better assist you, please provide a brief description of your current setup using this link as a guide.

Make sure to describe your network configuration/topology, including any networking hardware currently in use, so we can have a clear understanding of how your devices are communicating.

Has this happened more than once? How often does it happen? Is it always the same albums each time?

Can you share a screenshot of Settings > Storage?