I was cruising at 70 mph on a downward slope which was twisty at the same time. I had to brake to slow down to about 60 and while doing that, after braking a second time, I saw the transmission was shifting into 5th and then as the car was going to get faster due to the slope, it then shifted again into 4th to maintain that 60 ish speed. I think it was amazing, as with other cars of mine I had to either stepped on the brakes constantly or switched off overdrive to slow down the car. I our CX-9 transmission smart or is it just a coincidence?