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小概率DM6437死机,复位后,仍然会死在相同位置,断电重启才行



请各位高手指点:
出现问题概率比较低,如下问题

M6437上电后运行一段死机,输出的画面卡住

POR复位后,差不多运行相同时间后,输出画面同样卡住
断电重启后,正常运行
画面卡住时,输入电流略有减小(正常280MA,死机时250ma)