Quote Originally Posted by skiwi View Post
Then it is a bug concerning "Reserving instance" and then losing a player in the process. Please check if it has been posted yet in the appropiate bug forum and if not make one to help your fellow players.
It isn't a bug; it's a design choice. When you lose a member (because they failed to accept queue or because they withdraw), your group is considered a new group and is placed at the back of the queue. This isn't something done "by accident".