I'd guess it's a manufacturing fault unless you've been really overtightening them, new calipers are cheap if you can find them though, only thing available with Madison is M6100 but somewhere might have stock of MT200 or MT410.
Wondering if the adaptor to blame. Stressing the caliper?
I'm going to order a new adaptor and caliper.
Could be, if the holes aren't lined with the caliper. I never seen anyone breaking one of these, rounded bolt if anything.
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