In my case, the top operation--going up--seem to slow a little bit shortly before the motor failed. It wasn't obvious (and would be even less so for someone not already familiar with the top's operation).
You might ask a BMW dealer to check the car's work records and see whether the motor has been replaced previously. I believe they can do that online, and they might be willing to do it for free if you indicate that you'll be bringing the car to them for regular service.
Good luck!
Rick F.
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