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@Scilly.Suffolk
Ha! Sorry, I meant "how much torque do you use on the joining bolt"? Some of mine say "42Nm" others "42Nm - 60Nm".
My suspicion is that they added the upper limit in response to problems like yours. If you haven't already, try increasing the torque.
There are some other things to try in the link I posted above.
Not had a problem myself across three bikes and one I did for a friend: all cups installed the "Loctite & hand tight" method.