I've hit some problems where my connection got spotty, and the client hung. I'm not sure whether the connection problem is on my end or on your end. But resuming has been a little rocky--just now, it refused to let me log in (saying I was already logged in); other times, it's kicked me out of a fight. (Which is particularly problematic because I think that counts as a loss--it needs to, to prevent voluntarily dropping from being a work around, but I've had connections boot me when I was about to win. Any chance that the state of the fight could be restored from the server side?
Actually, at least one time it didn't count as a loss--that's potentially gameable (in the bad sense).