Front Suspension Hub problems of the 2008 Chevrolet HHR

I purchased this car in December of 2010, as a certified used car. It had 13435 miles at the time of purchase. After six months, 17000 miles, service lights began to light up---I took it to the dealer. After taking it home all seemed to be operating normally when in August, 17100 miles, I began to experience a shuttering when braking and a clunking noise while driving. Dealer repaired, harness and hub bearing and I purchase two new front tires. Within about a year car began to shimmy again when braking. At 25000 mile , dealer stated now brakes are bad, warped and rotors need work. Within 6 months of taking car home, shimmying began to start again. I have seen many complaints on line with regard to the brakes, but gm denies any knowledge of problems. Hmmmmmmmm!.