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CSD19533KCS: Gate, drain and source gets shorted

Part Number: CSD19533KCS

I am using this nexfet for bidirectional power flow that is for 1 mode of operation switch operates and in other mode, its anti-parallel body diode operates. I am using this switch for bidirectional dc-dc converter. However with only 1 mode operating, as soon as power supply is switched on, the gate, drain and source of mosfet gets shorted. Please suggest any reason why this is happening. I am using switch IRF540 for the same application, however its anti parallel body diode, gets highly heated and consumes high current during second mode. 

Please suggest if possible that why the terminals are getting shorted.