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LMR54406: Regulation failed 24V at Output

Part Number: LMR54406

Tool/software:

Hi there, i have a set of ten prototypes with the LMR54406 mounted. 

It is used to generate a 5V from 24V. 

Problem is: three of the ten prototypes are not working correctly. There is no voltage regulation and input equals output, so instead of 5V i have 24V at the output.

Is there anything i can do ? I already changed one of the LMRs with a newer one, but same problem.  

Best wishes 

Martin