For the second time in less than a year, the rear driver's side brake caliper bracket has frozen up, causing the back pad to be stuck against the rotor. The pad wore down and ruined the rotor, causing premature replacement. This time, the caliper was frozen up and needed to be replaced. This does not happen with any of the other wheels, only the driver's side rear.

Sounds like this may be a common problem. Did not have much warning