I don’t want to confuse matters as Dimitri was a great help to me but I too was having an issue with Network packet errors and I could not be in a room with more than two JK members. My 2 cents is to not only make sure your WiFi is off but to actually go into system preferences, network, click on WiFi and select the minus key and remove it. (You can always add back) Since you are Ethernet you will not need it but it will now eliminate your Mac opening up a conflicting IP address. You can see this in Terminal. This is what was causing my Mac to fight for the same ports in JK causing packet loss and the ability to only jam with a few members before all failed. Try it as it worked for me and another Mac user with a similar issue to me. Good luck!
Thank you again Dimitri for teaching me Terminal commands to see and diagnose things as they happen.
Thank you again Dimitri for teaching me Terminal commands to see and diagnose things as they happen.