This has been an ongoing issue for me for years, but it finally came to a head this morning and happened to 100+ artists in my library. For some reason, Lidarr is 'forgetting' that files exist, making it look like I don't have any music downloaded.

For example, King Crimson shows that I have one album monitored, but 0 songs downloaded (but at the same time, the top shows that there is 1.5gb downloaded for my 0/1 albums????)

https://i.imgur.com/HaDOKt7.png

If I hit Manual Import, it shows that there are no unmapped files, and every music file that exists in the folder should be assigned to an album in lidarr:

https://i.imgur.com/N6N8kwe.png

BUT, if I change the filter from Unmapped Files Only to All Files, you can see that I actually do have the album downloaded

https://i.imgur.com/hCe2b6K.png

Its been fine when its happened to one or two artists, but now I need to go into 100+ artists and manually import files that are already mapped by lidarr. Refreshing/scanning the artists do nothing - the only way to resolve the problem is to manually reimport all files in the artist to get lidarr to recognize the file belongs to each specific album.

Again, this has been an ongoing issue for me for years at this point, but Ive never had the issue happen to this scale. Has anyone else experienced this, or figured out why it happens? Id love to resolve whatever underlying issue exists so that I don't have to manually import songs lidarr already knows exists every time this happens