Frame And Members problems of the 2005 Saturn ION

Metal fatigue on passenger car door of Saturn Ion quad coupe redline, where hinge attaches: the problem occurred over a period of 2 years during which time I would open and close the door each day a minimum of 10-12 times to strap my infant into his carseat. The door metal cracked and began to separate from the rest of the metal, to the point where the door is read to drop off the hinge. I brought the vehicle to a gm dealer in response to a recall on the catalytic converter, at which time I requested them to look at the door. The dealership had never seen anything like it. However, they concluded that it was not their responsibility since they were unable to disprove the door had not been forcefully pushed backwards.