Torquing wheel nuts
It isn't overtorquing that does it, it's uneven torquing across the wheel.
A lot of garages do up the nuts with an air wrench - not good enough for the 17" alloys of the R variants, though it is probably OK for 15" steel rims on standard models.
An acid test for tyre replacers is to see whether they torque up the nuts unasked, using a torque wrench ONLY.
I've bought my own and now slacken off and re-torque the nuts after every session when the wheels come off - it's cheaper than replacing warped discs!
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