"Config sync" loop with firmware V2.3.1.44

YES! Lesson learned the hard way. DO NOT separate the SSIDs. If you need to have a separate SSID for 5G, then buy a solution other than the Orbi. I resisted going to one SSID but very glad I did. As noted above, the thing that finally convinced me was a problem I didn't even "see" at first, which was HUGE variation in packet round-trips when conneced to the satellite (and router, too, but less so). 

If you're just doing a speed test or downloading files, you won't notice this because when loading a web page or downloading a file, your device can easily reassemble packets out of order. But for things like gaming, audio/videoconferencing, etc., having some packets arrive a second late is deadly. I'd advise ANYONE using separate SSIDs to absolutely check for jitter to see if they have this problem, because it's something that could be really hampering your performance and you might not even realize it.