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TPS57140-Q1: 触摸芯片4,5脚电阻、电容,电源芯片无输出

Part Number: TPS57140-Q1

电路图如下:

输入电压DC24V,输出电压5V,pcb布局如下,电路能正常工作,并且已经做过相关环境测试均正常,试验部门在测试中,用手触摸触摸C4,R7的两端时,芯片无输出电压,手拿开,输出电压正常,他认为这是设计缺陷,请帮忙分析一下原因?

PCB图,红色部分为C4,R7: