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请解答用手按在TPS53315上面,该芯片要停止工作。

Other Parts Discussed in Thread: TPS53315

我按照TPS53315数据手册推荐的图33做了电路,该电路能正常输出1.1V电压。但用手使劲按在该芯片上,电路会瞬时掉电,输出变为0。这是为什么?是手接触了那个引脚引起的?做了200张板子,都有这个问题。手不去接触芯片,电路工作正常。电路图如下: