ESD protections MP100L

We are using MP100L to provide 3.3V DC to sensor. We are still in prototyping stage. We have noticed Vin is getting shorted to Ground in some of samples. Otherwise circuit is working fine and no issue. We are using all surge protection feature as per datasheet-CX capacitor pre rectifier and MOV.
How prone is MP100L to ESD ? We are thinking if MP100L is getting damaged during handling.



Here is the reliability report for MP100L which shows the ESD test details, Report/lang/en/sku/MP100L/document_id/10/

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