Hi @Alan_Meldrum,
According to the most recent diagnostics, this Nucleus is beyond its hardware performance capabilities and reporting out-of-memory. Unusually high database validation times - triggered by track corruption that is detected in the iTunes library - are causing this Nucleus to overconsume resources. This is likely a downstream result of the large number of albums and playlists in this library - although you’re below the 100k track limit recommended for a Nucleus of this RAM, the object and metadata volume is on the order of magnitude of a much more massive library.
What is the specific number of playlists you have saved in Roon (before they began to disappear recently, per your other thread)?
In the long term, you’ll inevitably need to upgrade the RAM of your RoonServer machine as this library - and your curation thereof - expands.