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Please reboot a camera first. If this camera is still disappeared, please check whether this camera and your PC are in the same network.
Even a camera is in same network as PC, some camera will disappeared within 20min after rebooting. There is a setting of broadcasting period in each cameras and in some model this period is default 20min. If you would like to change setting, please access camera by browser and find menu of "Easy IP Setup accommodate period". If you change "unlimited", camera will not dissapear.