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@neilbah
I work in a bike shop and we've seen a fair few for inspection the last couple of weeks, including two non listed codes which have the same issue. I personally have broken 3 in the last couple of years - price point of chainrings meant i bought a new 6800 and then a new R8000. They failed in reverse order with the R8000 lasting the least time and then swapping back to the old units which eventually failed too. I only kept the last one annoyingly. All three had the same failure mode - RH crank, slight click, pedal went a bit wonky feeling followed by inspecting it and seeing delam of the rear plate or hairline crack just bove the serial number area. The only other thing to add is that Miche shouldnt be saved from scrutiny as theres a certain crank of theirs that fails rather a lot too.