Lose control over steering wheel

Hello fans, I have a problem there again and hope someone can help me. To the dates, I drive a mini cooper clubman s r55 bond street 184 hp and 78000. I already pulled new rims on it two weeks before Easter, ats 19 inches. But now I noticed that when I drive into the curve and there for example a punch hole or a Gulli cover is that I somehow lose control of the steering wheel. What can that be? Until recently I did not notice this yet, I always get a slight shock when this happens to me. So it happened to me on the highway. Maybe you have a hint for me. Thank you already….