I appreciate your detailed, well-written post, and your calmness despite the irritating circumstances!
I have added this to our database for investigation.
This sounds very similar to an issue being reported on PC, which is currently under investigation. I’ve added your experience to the internal report.
These are much harder to deal with, admittedly. On PC we can simply request console logs or network monitoring logs, which isn’t really an option on consoles. 
Do you usually play with the same people, and is there one consistent person that hosts?