There was a BMW TSB to replace the crankshaft bearings for this issue announced last November for the 3 cylinder 1.5 Turbo. Mine was done almost straight away at my insistence for safety reasons, though I didn't experience the symptoms you've had. There were issues with getting all the parts at the time, and 3 days turned into 2 weeks. No issues experienced since.
I would be asking why your service department didn't get in touch!
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