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TLV62568: Input is failing shorted to ground 5 Volt in and 3.3v out

Part Number: TLV62568

Having trouble with this chip TLV62568.  Input is failing shorted to ground.  has happened on 3 parts back from field.  one failed while I was looking at the returned product.  The 5 volt input was already being pulled down to 4.5 volt and the output was 4.5 volt also. Switch pin was switching ~3.3v to 4.5v (not to gnd), output was at 4.5 volt (not 3.3v) then a few minutes later the chip totally failed and the input shorted to ground.  Replace the TLV62568 and all is well.  any ideas? 

The input pin is failing shorted to ground