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LMZ14203: Unknown failure mode in new design

Part Number: LMZ14203

We have a new design with the LMZ14203TZ-ADJ/NOPB converter.  We have roughly 50% failure rate at power-up.  I can't find anything obviously wrong with the board or design.  Can you give me a list of things that will destroy these units?  These units have built-in protection against a wide range of failures.  We already have protection against reverse input voltage, and input overvoltage.  Output loading is very light.  What am I missing?  Thanks.