Multiplayer Problem Please Help!!

[ACE15]

I have been having a problem where I will get in a multiplayer session and 30 seconds later messages appear saying one by one that each player has left as if they actually did but they didn't, then it says cannot connect and sends me back to mine. Then i can go back and everyone is there but the same thing happens.

Any idea of what it is or how to fix it?

(If any other information is needed just ask. I will be on here every week day from 3:00pm to about 4:00pm thank you)