[LAU] How to troubleshoot a zita-njbridge connection

So, I am having an issue with zita-j2n ... I have a setup for streaming audio across my home network. There are two Linux boxes involved, both running Arch Linux; both are connected by Ethernet to the router (well, actually the broadband modem, which serves as a router). One is my desktop computer (which I will call the client), the other is a headless media server (which I will call the server). The client machine has headphones, and the server has speakers. I need to be able to send the output from arbitrary sound sources on the client to either the headphones or the speakers. So I have Jack running on both machines and need to send audio from client-side Jack to server-side Jack. I also have an Alsa loopback interface setup on the client, because I need to play music from programs that don't support Jack - e.g Spotify or web-based sources like YouTube and Soundcloud (BTW, I am a musician and sometimes use pro audio software on my desktop system, but this particular setup is not for that - it's mainly just for listening to music). I had a version of this setup that worked fine for several years, but it used Jack1 with the network backend. But a few days ago it stopped working for some reason ... anyway, long story, but I decided it was time to switch to Jack2. And I saw that Jack2's network backend isn't usable in the same way, so I decided to try zita-njbridge. So, I've more or less figured out how to do this, and have modified the Python script that manages all the client-side components to use zita-n2j. I can play music on the desktop machine and stream the output to the server and hear it on the speakers. So, good. However, zita-j2n crashes frequently (sometimes every 3-5 minutes) with the following message: Fatal error condition, terminating. I would like to find out what is causing these errors. The server-side system seems solid: Jack and zita-n2j run continuously for several hours with no apparent problems. So it seems likely that the cause of the problem is either on the client machine or the network. Apparently zita-n2j doesn't have a debug mode, so I don't know how to gather the info I need to solve this. Any suggestions?