I looked into that, and unfortunately seems like this is a more or less common problem. If a person is in a battle for more than 40 minutes there is a really good chance of this bug happening. Basically the server drops connection somewhere between 40 minute to 1 hour. This won`t happen every time but until we fix this it`s best to avoid these long battles.
Oh and check your Private Messages here on the forums, I sent you a message with a little something to make up for this experience.