Hi @Snowdog,
At long last, we believe we’ve identified the most likely mechanism for the symptoms you were experiencing on this thread. Your most recent logs indicate that you’re probably still experiencing this - is that correct?
We have ongoing work to address the underlying problem here, which has to do with low tolerance for certain ratios of album/artist/track within file storage directory. Specifically, too many Artists with a large volume of sub-contained locally stored Albums is a possible mechanism for throttling performance in Roon.
If you had to guess, how many albums do you have for your top five artists in your library (by album count)? You can get a good sense by navigating to Library → My Artist and sorting by Album Count. You can export this by selecting all and clicking on the three dots to Export to Excel; this will give a precise count of albums per artist.