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PS40140 power circuit's MOSFETS going bad

Other Parts Discussed in Thread: TPS40140

We are using TPS40140 for converting 12V to 1V8 (1.8V). It has been observed that the MOSFET used (IRF7914) is burning and as a result a 12V to GND short is observed.

1. Please tell if the issue is happening during the STARTUP of the device or related to it.?

2. Or may be the MOSFETS are getting turned on during powerup? 

3. Or, anything related to the circuitry used?

 The circuit used is as given below:

Please help us solve the issue.