Sweden

My RX400h (2006) engine sometimes give an extra "push" when slowing down. It feels like the gearbox gears down and gets more "powerful" around 25-20mph. It is not dramatic and I am now used to it, but my wife how drives only 1-2 times per month does not like it, as it feels like the car accelerates on own initiative for a second or two. Anyone got similar experiences? Tips on what to do?