Probably happened because of same issue, but when you check your OWN EQ in dungeon (press T) it's often you got so3d (disconnect without the message), or when feeding pet, or when changing armor (usually I change eq for combat and for run when clearing sage tower normal floor 1 for rubies, but since some months, I don't do it again, I also prefer to changing pet rather than feeding it cause I'm afraid of disconnection).