3 out of 4 duels I've had have either lost connection in the middle of the duel or similar, I've only managed to have one successful duel in the past two days. Other duels give me a lost connection error as soon as everyone's ready and the host presumably starts the game.
What I propose is a more useful error message than just 'lost connection'. That doesn't tell us anything, it doesn't help us, and it doesn't help you to figure out what the problem is either. Tell us if the problem lies with us, one of the others in the duel, or with the server. As it stands, the error message is so generic it might as well not even be there.