Some excellent detective work by Mr Quick has revealed that there has been a dodgy batch of crank end nuts on the clutch side and these are coming loose. The UK importer has seen a few already.
Hopefully, replacements will arrive tomorrow in the post and I shall be taking the clutch case off to check if this is the issue.
Part number at fault is : ME250032018 - Crankshaft Pinion Locking Nut
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