Encounter "Game Full" while muling

Same thing happened to me diablo3, only with a much more costly item, Anyhow i joined a room i knew always have people, one of those free rooms. There was 2 people and myself, i dropped the item, got my other char, there is no way 6 people joined the game within that 10 seconds, but "game full". was very much BS, so i sat and tryed to join the room for 20 minutes, then all of a sudden, 1 second the game is full, next second the game does not exist. grrrrrr, it pissed me off so much.

But now i can run 2 copys of d2 on the same pc, muling has never been easyer.