I have my Roon server and music library running on a Sonic Transporter - Small Green Computer i5. My Roon server has been freezing or crashing about once a day for a while now. Sometimes it happens while I'm scrolling through my library. I will get the message looking for Roon server and my screen will just show the spinning wheel. Occasionally it happens in the middle of playing a song. When it crashes sometimes it restarts on its own after a few minutes. Most of the time I have to restart it manually.
Thanks for writing in and sharing your report, welcome to the community as well!
Based on your account information, it looks like you may have a library on the larger side, around 200k tracks - is this accurate?
It may be the case that your Sonic Transporter is having a hard time managing this library size. Out of the 200k tracks, are you able to see what number are properly identified in Roon? You can do this by navigating to your Tracks>Focus>Identified>Inverse this filter.
It may be worth getting in touch with SGC directly to see if the ST is able to handle your library size.