About 4-5 days ago my A/T transmission started acting up. Whenever I switch from 5th gear to 4th gear ONLY in SPORT mode it does this. It will sometimes do it from 3rd to 2nd. It also feels like my car shifts hard, but I think that is normal. The higher the revs when I downshift the more you can feel the problem. I have no clue what's going on...I think it is slipping? This is my 1st car so I haven't really experienced other problems first hand. Anyways I made a video so you guys can see this. You will hear when I click to downshift, then it goes down then shoots right back up.