front end shaking and sliding with sharp left/right turns or when doing circle

What is your question?

2013 Cadillac CTS 3.0 Luxury Collection Sport Wagon 4D AWD. the front end feels like it is sliding and shakes the steering wheel when you make sharp low speed turns left or right. IS FINE WHEN GOING STRAIGHT OR NORMAL RIGHT OR LEFT TURN. ONLY DOES IT IF YOU GO A ROUNG A ROUNDABOUT. OR SHARP LEFT OR RIGHT TURN AT LOW NORMAL TURNING SPEEDS. JUST BOUGHT USED CAR TODAY AND FELT IT WHEN PULLING OUT OF GAS STATION LENNY

What makes this problem better or worse?

LOW SPEED SHARP TURNS WOREST. GOING STRAIGHT OR 1/4 TURNS NO PROB.

How long has your 2013 Cadillac CTS had this problem?

FIRST SHARP TURN I MADE WHEN LEFT THE USED CAR LOT. 5 MIN AFTER PURCHASE