I usually keep it on the same setting but I think I must of caught the selector wheel as I pulled it out of the bag! Always carry batteries too, but I figured that by the time I changed them she would have been gone.That happens to us all. I was taught to set your camera to known and familiar settings before you put it away. You know then what your starting with when you pick it up. A spare battery to three helps too. I have been taking pictures seriously for a while though.