I would suggest turning off "autoconcede when opponent has lethal".
Sure it saves at most 20-30 seconds if BM, but sometimes bot does not check if it has lethal itself before autoconcede.
I'm not sure if this was fixed recently, but noticed on rare occasions that opponent would have lethal, and bot would concede WITHOUT playing blizzard and attacking face and having lethal next turn.
I.e. bot calculates if opponent has lethal at the start of turn and concedes before checking if bot itself has lethal/stalling for 1 more turn.