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LM25066: Debugging LM25066

Part Number: LM25066

Hi Team, 

Our customer is debugging exactly the circuit shown below. It's not their first design and have another LM25066 with the only change of a bigger sense resistor currently working ok on the same board.

After connecting the input 12.5V without load on the output, pin Gate keeps low. There's also no voltage drop on sense resistor.

I do a clear faults, and this is what shows:
register 0x7C  with value 0x04 (OC fault)
register 0x79  with value 0x2841
register 0x7D  with value 0x00
register 0x80  with value 0x00
register 0xD1  with value 0x0003

Then if they write an 0x08 on register 0xD7 (gate mask to an unknown bit) the gate pulls high,  get voltage on the ouptut correctly and they get the same as before only changing:

register 0x79  with value 0x2801

The customer didn't make any further tests on this state with the masked gate because they understand it is not advisable.

Not sure what is happening. They are waiting on getting delivered more ICs to test but got this behaviour on 2 boards.

Please let me know your comment.