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"the (far and away) most common reason for rotors to warp is HEAT"
well, sort of. It's actually the uneven temperatures or uneven pressures across the rotor that does it. If you heat the rotor evenly and then let it cool evenly, it will never warp. Rotors warp for 2 main reasons.
1) people don't torque the lugs evenly which creates more stress on one part of the rotor than another. When the rotor gets heated up, the metal tends to conform to those stresses which warps them.
2) people brake hard and then sit at a stop light for 2 minutes with their foot on the brake. The part of the rotor that's under the pad will cool much more slowly than the part of the rotor that's not under the pad. The uneven temperatures will cause the rotor to warp. That's why it's a good idea to leave enough time to stop without braking hard, and it's a good idea to, when possible, be off the brakes at stoplights.
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