Scooby Chick

and I drove it to Import War in PA this weekend. It has right under 1,000 miles on it now. I noticed that only when I drove it for like 250 miles straight to PA and on the way back, towards the end of both trips, when I would slow down almost to a complete stop, it would downshift wicked hard. Any clue why? It isn't doing it anymore but it should not be doing that. It's an auto.