My disks (front and rear) lasted 72k including a few laps of Nurburgring. Are you sure you aren't wearing your pads out and then running metal to metal on the disks?
Alternately, if you've cooked your pads you could find you get a vibration until they wear surface off.......... I only replaced my disks because they were lipped - not because they were warped......
If you are heavy on the pads, go to a higher performance - something like Ferodo DS2500s......