Hi @rcrawley,
Roon Radio will always feature the highest-quality version of a track in your Library. The above - switching to Tidal when local is available - will happen under two circumstances:
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for whatever reason, Roon can’t access the local file. The filepath is temporarily or permanently invalid, permissions are rejecting Roon’s access, or the track has been corrupted. If on a network share, the network reachability changes may temporarily block the Core’s access to the content. Tidal content would then fail for the same reason, temporary network loss.
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your endpoint or Device Setup settings are restricting playback of the Zone to a certain file type only available in Tidal.
Recent diagnostics indicate Roon is struggling to mount a storage location upon startup. I recommend verifying whether or not this Mac’s ability to access stored content may be fluctuating, as it would underpin the playlist wipeout behavior you previously experienced and many of the errors in current logs.
Having reviewed your situation more broadly as a team, you’ve more than likely been encountering a known/ticketed issue with Remote discovery after Backup Restore that you’ve since resolved with the new out-of-the-box installation (new DB). If you encounter this problem again, a known workaround that should relieve symptoms is to reboot the Core twice or more.
Otherwise, the endpoint loss and dropouts with the RoonBridge are the result of the networking conditions discussed separately in this thread: Network Reachability Changed, Immediate Out of Memory Crash
The team will follow up there accordingly in that thread, but as a first step, try verifying that multicast is enabled in any routers to which you are connecting endpoints and Remotes. Multicast failures are persistent throughout diagnostics. Thank you!