Hi, I seem to have a similar issue, atleast I think so. It's been years since I last played the game, but whenever I join a server it kicks me out after about 10 seconds of running around. All it says is "Warning, you were kicked off the game". I've tried reinstalling the game and veryfying the game files.
Help would me much appreciated :)
https://steamcommunity.com/id/BounceyElf/