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TPS54360: short circuit fail at 45V

Part Number: TPS54360

I have designed SD circuit to convert 10-50V to 5,4V 2A

It works nice during normal test, Vin= 10V to 50V, when I gently connect/disconnect V+

but during a test when I try to disconnect/connect V+ of power supply several times,

after a few try, the TPS54360 fails and Vin (pin2) shorts circuit to GND (pin7)

this failure appears only at voltages 45-50V,

there is no problem at voltages 10-40V

please tell me why this happens? what should I do to prevent failure?