Chances are someone at the dealership left the window unlatched. The latches are adjustable for tightness. When you replace it be sure there is enough tension to hold it snug, but not so much to stress the unit.
Doug and Cheryl
2012 FC RB, Michelin 16, ProPride 1400
2016 Ram 1500 Laramie Crew Cab 4X4 Ecodiesel 3.92 axles
The Truth is More Important Than the Facts