Thanks for reaching out with the report. I activated diagnostics and it looks like your Roon OS drive still has space, so I wonder if this could be a DNS issue.
We have seen users have a better experience in the past if they change their Router’s DNS servers from the ISP provided ones to Cloudflare DNS, Quad9 or Google DNS. Can you please give this a try and let me know if it helps?
I have now changed my DNS servers to Cloudflare DNS. I also rebooted the router and the Nucleus+ and powered off and back on all my switches. Unfortunately no improvement.
Update: Prodded by your suggestions, I decided to take a more drastic step and try actually reinstalling the pfSense software on my Netgate router. Not sure why, as I haven’t noticed any other problems of any kind, but the reinstallation on the router seems to have fixed it! Thank you for your help.