@connor performance has improved A LOT with this build, connection to Arc is resilient. I got sometimes the error of the library not loading on Roon remotes with this build, but it seems there is some resilience since the problem seems to solve itself after some minutes without having to reboot Roon server. HOWEVER every time this happens Roon search stops working, needing to restart the server to work again (and Arc keeps connecting, so it may be a different kind of problem.)
BTW, I use last.fm as well. Thanks for sharing that the underlying cause was there.