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上位机连一会后总是掉。先连保护板再打开上位机，和先打开上位机再接保护板都试过，都会出现。先打开上位机再连保护板坚持时间长一点，如果先连接好所有线直接再打开上位机，有时会直接报故障。故障如图，请问是什么引起的，如何解决？谢谢
