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TI的TPS737使用问题

Other Parts Discussed in Thread: TPS737

具体电路图如上所示,其中R18为52.3K,精度为1%,C22改成了30K电阻,精度为5%。

遇到的问题为:PCB上电后,TPS737输出3.1左右,过了大概3分钟掉到了1.96V,无器件发热。总共打样了10块PCB,其中有两块出现这种情况!请教!