The game of 21 at the Crone, also called Royal Dragon, can get hung up if someone starts a game and walks away or doesn't finish it. That is, no one else can play the game or reset the game until the original player returns to finish it, or the server resets.

My suggestion is having the games always terminate after five minutes or so. If you ran off in the middle of a game and never came back the dealer would probably keep your cash anyhow.