For some reason our system judged it was your connection that was the problem. Sometimes it's not a loss of connectivity, but just a hiccup, a flash or browser error or another program suddenly hogging to much bandwith. I checked your records, and this is the first time our system has judged your connection to be at fault in a disconnect since you started playing. My guess is it's probably a fluke, and isn't likely to happen often. If it happens again, let us know and we'll see if we can troubleshoot it. BTW, I don't know exactly how our system makes the call, so I can't comment on how accurate it is. I can tell you when I'm at my parents and steal my neighbor's terrible wifi to get a round in, the system always realizes it's my fault when a duel crashes out so it can't be all bad.
"Scissors are overpowered. Rock is fine." -Paper