My other M3 (actually a Mazda3) had a similar issue. The rotors would glaze from only seeing light usage around town from my wife. I had the rotors machined and the vibration went away.
You or the tech probably need to bed the brakes in.
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2018 F30 320iX Melbourne Red
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red
2000 E36/7 Z3 Steel Blue
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