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TPSM84A21: SMT failure issue

Part Number: TPSM84A21

Dear Sir,

We used TPSM84A21 to generate 1.0V and 0.85V.

After SMT, one TPSM84A21 which outputs 1.0V  works well, but the other one which outputs 0.85V does not work.

The failure rate is about 3/10 after SMT and it only occurs on that 0.85V IC.

Do you support manaul or requirements for SMT?

Also could you review help us to review our PCB design?

Thanks.