Has nothing to do with country of origin. My opinion is based on this particular manufacturer and my first hand experience with their track specific cranks: Mighty/Super Mighty/Aero Mighty/75/Grand Mighty. None of these have shown that kind of failure.

Yo!:
If it is like you say it is, please do all of us here a favor and take this up with the manufacturer and not a retailer. Maybe there was defective batch that got sent out and Sugino needs to know.