Your issue sounds very similar to the one I reported on this link: https://community.roonlabs.com/t/roon-2-0-constantly-crashing/216986
I am also running an 8 GB Mac Mini on Monterey 12.6. It was very stable on 1.8 - however, I did find that due to memory leaks I needed to schedule it to restart every day. After that, no problem in 1.8. The Core will not run more than a few hours without crashing under 2.0, whether I am playing music or not.
I have also had some less frequent but similar crashes on my MacBook Pro remote. This is a new M2 Mac Book Prop with 24GB. If running out of memory is what is causing the crash, then 2.0 is misbehaving pretty badly.