Hi, I am wondering why I can't find a match with my friend, if we go in a same lobby, one of us will be dropped and one of us can confirm the match and play.

After that, I try to join his room while he is playing, it will be crash or no respond. Or, I try to find another game, but still no connection to the server.

Is it the problem to do with that we play with a same WiFi modem or same router? We are playing in the same house. Can you help me to fix this,please?