2010 Hyundai Sonata body & structure problems

I bought the car in november of 2009. The car is a 2010 sonata. Since I have purchased the car I have had to replace 3 exterior door handles. The dealer covered the first on but I had to pay the other 2. Because I drive long distances and my car is out of warranty. What does high mileage have to do with door handles.

Front passenger door handle broke off while opening door to enter the vehicle. Went on-line to research repair. Found that this is a very common problem on all 4 doors of this vehicle. Subsequent failures on other handles tend to happen within months of one-another. Doors that are infrequently used also have the problem. This poses a serious safety issue when removing an infant, sick, or injured person from the vehicle during an emergency. The handles are made of plastic.