I just got out of a game on the Asian server. My opponent played an 8/8 Wretched Queen, then nothing for a while. It was long enough that I was starting to wonder if I was being disconnected rather than him roping me, so I tried to close the window of Hearthstone and reconnect to see if I could salvage the next turn. On getting back in, I was brought directly into the main menu without attempting to return me to my game.
The odds I lost in the short time I was gone were slim to none, but hopefully it can be verified. It appears next time I think I may be getting disconnected, I’ll have to sit and wait if it means a guaranteed loss trying to reconnect.
Since I see there’s something about this in the known issues, I should state that I didn’t leave the game with the quit button. I right-clicked the application in the Windows taskbar and selected “Close window”.