I recently shot a car show with a a runaway ISO setting. I managed to repair most of them in Lightroom to a somewhat usable condition. My non photographer friends didn't notice or didn't say anything. I was skewered my my friends that are into photography. It was a painful lesson for me but now I know to be careful and more observant of my settings.
I have the a9 and shoot in manual a lot and auto iso drives me crazy , its the same on my a99i why do sony tie your hands and assume people need iso auto pushing on them and worse than that limit the level of steps ie 3200 then 6400 must be they think we can not work it out