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You are the first person in my career that I’ve heard this from. So I have nothing to go off of.
It is common for a person to warp the stock rotors. I keep them in stock it is so common. But then, I replace the rotor and I never hear from them again – presumably because the problem was fixed and they rode off happily into the sunset.
No one has ever called me back 30 days later and said “ok, I warped the next set”. It’s never happened. All my recommendations will be based off of real-world things I’ve seen and done. Since this has never happened to me, I can’t say “oh, it’s the XXXX part, or adjust the YYYY thingie”.
Generally when something weird is happening that I’ve never seen before it is caused by something that I cannot predict – the person that has been working on the bike. In other words – someone fucked the bike up somehow. I don’t know if this applies to you or not. The first thing I can think of when I think “how could someone mess up the braking system on this bike” would be to strap the bike down to a trailer and pinch the brake line with the strap. Then the line is crushed and won’t allow fluid to move properly. Another thought is that someone tightened the handle too much – it’s not springing back. Maybe they used the wrong brake fluid? I don’t know. I do know that I’ve not yet seen a caliper stick to the point that it would warp multiple rotors. Usually when a caliper sticks it clamps down so hard you come skidding to a stop and the rotor is blued through and through. I’ve seen this on other models.