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UCC28950: 使用UCC28950加两枚UCC27424通过隔离变压器驱动mos搭建的移相全桥电路发生炸机

Part Number: UCC28950

在量产时,带载后发生0.5%左右概率的炸机,超前臂滞后臂的4个mos管GSD都被击穿短路,更换管子后又可以正常运行,目前故障无法复现,请问应该从哪方面入手解决问题