"Internal Exception: java.net.SocketException: Connection Reset"

I get kicked from my friend's Realm after a few minutes, sometimes it's instant. The thing is that when we go to another world I don't get kicked, the error that shows up after getting kicked "Internal Exception: java.net.SocketException: Connection Reset", I don't have a wireless Internet connection, and I have tried everything that says in Minecraft Help Center. If someone could help me I would appreciate it a lot. (I started playing in the Realm since the last year and it never happened to me).