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ina199a1 损坏问题

使用INA199A1作为装置usb充电的电流检测,RS=2.2Ω, V+接3V,REF接地,负载最大耗电流小于80mA/5V,输出out接单片机的ADC,如图。

试做样品均是可以工作的,输出正常;但是在小批量生产的时候出现损坏问题,明显特征测IN+/IN-对GND的电阻,好的情况下该电阻值=400kΩ,损坏的情况下该电阻值=40~200Ω

求助不良原因~~~~