Bob,
Over the past week or so, my JRiver Media Center (Mac version 31.0.83) has crashed the same way, with the same 'invalid access' fault, at least a dozen times. I have a 2020 iMac 27 inch, quad core Intel processor, 32 GBytes RAM, and I'm running Ventura 13.5.2. I have fiber internet, so bandwidth isn't an issue. The last hardware info is that I am playing to an external DAC via USB.
I have been burning in several electrical components in a stereo system, so I've been running Media Center around the clock. I have a playlist that has several hundred songs in it, and I queue it up and let it go. The playlist is a combination of songs that are on an external SSD, as well as others that I've collected from Cloudplay (a terrific feature, by the way). The system will run for variable amounts of time (several minutes to several hours), and when I come in to check on things, the Media Center is no longer active (the icon in the system tray does not have a dot under it). There is always a crash report.
To try to half-split the problem, I ran an experiment where I selected an album that I had the track flacs all on an SSD, and put them in a continuous play loop. In other words, no network interactions involved. The system has been running sixteen hours without a hitch.
I will switch back to a mixture of local and streamed tracks, and try to capture a trace for you...
Ron