I'm always skeptical of a "warped rotor" diagnosis. I'd bet that its among the rare events in the universe. Happens to someone else, never you. But what may happen is that the pads are stcking to the rotors, leaving behind a thin patch of brake material or corrosion. If you don't thoroughly clean a new rotor with solvent before installing, "warping" is almost guaranteed, as assembly oils and rust preventive coatings will burn into the friction surface. Same if you leave greasy paw prints on the rotors or pads. If you park outside in wet weather and don't drive it for a bit, rust will begin under the pads. So this could be a self inflicted problem.

Try this. After a normal drive, whatever that means for you, feel the center of your wheels. Are any of them unusually warm? If so, think stcky caliper. Next time you heve the problem, examine the rotors before you turn them: look for marks or discoloration.