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LM25011 Input Transient Failure

Other Parts Discussed in Thread: LM25011

http://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=FFCFE7DC32310A8A

I am trying to use the LM25011 as shown in the webench schematic above. It will work fine at 12.5V in with a 600mA load, and 16V in with the same load, but if I increase the input voltage from 12.5 to 16 while it is running, the FET shorts and Vout just tracks Vin. What would likely be causing this failure?