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TPS40009: TPS40009DGQR output is Abnormal

Part Number: TPS40009
Other Parts Discussed in Thread: TPSM82480, TPS62480,

Hi :

     When customers use TPS40009DGQR, Vin is 3.3V, output is 1.0-1.1V, current value is 4.5A. But after mass production, customers found that the PIN8 output voltage of the chip was 0, but it would be better to replace a chip. Through the test comparison, the resistance between PIN8 and PIN5 (GND) with output of 0 is 31.7 ohms. The resistance between PIN8 and PIN5 (GND) with normal output is 31.7 ohms. There is no abnormality. Please look at the schematic. What's the problem? Thank you very much.