You are probably getting kicked for member reservation. We offer a $15/yr membership to reserve a spot in the server so you won't get kicked if the server is full and a member tries to join. This also allows you to kick a non-member if there are 20 people playing. Glad you enjoy the server!
You can buy one here: http://gamrs.co/forums/index.php?/store/
If you are kicked for some other reason I'd be happy to check it out but I'm guessing it's just the membership thing