Whenever I go on the server, I can play for a short while but then the message below would pop up and I would be kicked from the server. At first I assumed it was poor WiFi but our WiFi is usually really good and the message started popping up after about 30 seconds to a minute after I logged on. Does anyone know what this message pops up for?

same happens to someone i know when they try and log on but it kicks them instantly after joining