产品已设计好，小批量生产时出现RTC关机后停在关机的时刻或者走两个小时停住的情况。
硬件上VCC. AUXVCC1.AUXVCC2都连到主电源，AUXVCC3接到纽扣电池，现在的操作是切断主电源前，关掉VCC1，VCC2。过一天设备再开机启动
就出现上面的现象，很难重现，但是试验一批总会有，把出现问题的再拿去试验又无法重现。
请教，切断主电源前还需要设置什么吗？
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