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Could be pad deposits. Have you ever swapped pads out? Swapping out with non-compatible compounds can cause this.
Resurfacing rotors isn't really a thing people do anymore. If modern vented rotors become non-flat/warped and have some miles on them, machining them down will further reduce face thickness and make them more likely to go non-flat sooner. Replacement rotors are usually cheap enough that it makes more sense to just swap them out.
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