LTC4367 mosfet burns at overvoltage

Hi,

      I am facing am issue where external MOSFET starts to smoke when the voltage is reduced from overvoltage condition to normal operating voltage at full load, at no-load condition circuit works fine. The design requirement was as follows-  normal operation at 24vdc, overload at 30vdc, max load current 7A. attaching schematic for your reference. Was there some problem with my MOSFET selection or any other components?