My ACURA MDX 2015 for last two months would "randomly" try to switch from 2nd gear to 3rd (at low speed), decide not to go into 3nd, and literally hurl back or forward and remain at the low speed. It means that only 1st and 4th gears still working and you can’t change the gear by steering wheel switches (no up, no down). When this problem started if I switch the selector, from “P” do “D” the car will experience the shock or hit from transmission, also if I switch a selector from “D” to “S” while driving the car will hurl back and significantly decrease a speed. This happened COMPLETELY randomly, which means even not every day. Once it started, it would last for the whole ride. When I re-start the car, it would disappear.