Library and connection problems

No troubles for months now after I updated router firmware. But lately I seem to be having library and connection problems. For example, overview says albums I added to NAS 4 or 5 months ago were added 3 days ago. Fortunately, albums I actually added 3 days ago also seem to be in my library and playable. And Tidal albums I have added are gone although a lot I never asked for but got matched to library, I guess, seem to be present.

Any ideas? Is it just me? Thanks…