In modern operating systems, an application like Roon should not be able to crash the entire machine. This is either a bug in OSX or failing hardware.
@mike is going to get more information, but a bunch of users have found that they have failing drives. Because Roons hits their drive pretty hard in its databases, it can sometimes cause a machine kinda limping along luckily to become symptomatic quickly.
I’m not saying your drive is failing, but if I were you, I would be checking that out in parallel with @mike’s investigation.
On OSX, this is super easy to do a quick check (if you are familiar with Terminal.app) … just run sudo dmesg from a terminal and see if you have any SATA/ATA/sdX errors.