Brake Disc Pads problems of the 2008 GMC Sierra 1500

Brake rotors warped at 15k miles, had them turned under warranty at dealer vehicle was purchased from. At 30k miles rotors warped again, this time 1 brake pad was worn down to 2mm thick, the rest appear almost new in thickness. Dealer turned rotors again and replaced pads for $200. Requested and was denied that the brake work be covered under warranty by dealer and gm cs. I took old brake hardware home with me and still have it. I contend there is something wrong with the design or materials in the brake system of this truck causing premature wear and failure of "non warranty" brake items such as the pads and rotors. I contend that there has been a hanging brake pad causing the rotors to overheat and warp since the vehicle was new and any work performed at the time of the 15k mile rotor turning did not correct the problem. If brake work needs to be performed on this truck every 15k miles there is a reason that should be covered under warranty. One time freak failure I can see, two times evenly spaced at 15k mile intervals and I think something is wrong with the vehicles brakes design and/or materials. Vehicle is daily driver, 15 miles a day to and from work. Garaged during the winter, taken off road (frozen cornfields, dirt field roads) for a week in late fall. Used to tow a fishing boat a few times a year. Owner is a former ase certified mechanic and is not an aggresive user of the brakes. Meaning I brake firmly and evenly when braking is needed, lifting my foot off the pedal once stopped and apply only enough pressure to hold vehicle still.