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TPS54331: 换批次出现Vref不稳定输出

Part Number: TPS54331

之前用的批次没有问题,最近换了新的丝印批次,出现Vref不稳定输出0.8V-0.9V,导致输出3.7V左右。更换旧的批次又好了。请问有哪些检测可以找出问题吗?

情况如下:刚上电短暂是好的,200多ms后,输出(蓝色线)抬升0.5V左右,Vref(绿色线)抬升0.1V左右,输入稳定不变。