I'm not too sure if this is a bug. However, it seems to me that when a player quits a game that is "loading" a system, that game is then re-listed on the lobby. This allows another player to try to connect thereby causing a bug that puts the game in an infinite "loading system" loop. Once again, I'm not sure if this is truly a bug, but I believe it is one of the primary reasons why some games never load.