I experienced a bug with Join Party today where it kept looping the join party with a friend over and over again. I sent an invite to two friends at the same time. One declined, the other accepted, but when it tried to join the other player who accepted it kept making the ding noise and leaving/joining over and over. Attaching my player.log file.
Player.log (964.6 KB)
EDIT; I was able to replicate this by sending two invites, and having one more person decline and the other accept simultaneously.