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TPS65266其中一路输出短路是什么原因造成的?

Other Parts Discussed in Thread: TPS65266

产品中电源用TPS65266RHB,输入5.8V,输出电压分别为4V、4V、5V,电流设计均为3A。其中5V那路是给WIFI模块供电,在批量测试过程中发现芯片5V的那路会出现短路的情况,换了芯片就好了。目前不良率大概为7%,有点严重,芯片都是从原厂买的,请问是什么原因造成的?