• Does sound a bit like your pedals are iffy (unless you have a truly wonky pedalling style). I rode SS mtbing for a bit (including a few races) with SPDs, and never unclipped accidentally, even when pulling up like a mo'fo during low cadence bumpy climbs - I reckon that puts as much high-force weird-angled stress on cleats as skidding.

    Have you tried swapping out the pedals/borrow another set of Shimanos from someone else?

    Did switch to ATACS though (for mud-clogging reasons at the time)...

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