I spotted this topic, see below, not sure if it’s related or not but it looks like @vova was waiting on some feedback before the topic was automatic closed. If that needs reopening let me know.
Personally, I’d install 16GB of RAM ASAP in the Nucleus, with 50K albums it’s really a no-brainer.
Once fitted, you should see a marked improvement in performance and stability, but if not at least is one less thing of concern.