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我们的DM365 IPNC 通过IE修改时间为与计算机同步或者自己设置时间,然后重启后就没视频了,视频成紫色,时间为修改后的时间,请问这是什么问题,但在拔掉电源放置一段时间后又有视频了,时钟为系统预设的时间,不是修改后的时间,请专家解答