I’ve had the same issues, seemingly since updating to SW version 2.5. (Running a SonicTransporter i5 to a microRendu.) The CPU spikes, the system stutters and stops, then comes back online after about 30 seconds. The CPU spikes may correspond to Roon Server “adding new music” - though I haven’t added anything to the library. It’s hard to replicate - forced rescans go smoothly. I’ll be contacting Small Green Computer for info too.