As soon as no live images from the camera or cameras are visible on the monitor, they must be reconnected to the DVR.
Please follow these steps for this procedure.
Open the menu
Select point 1
Click on the item Camera Pairing
Click on the corresponding camera for about 2 seconds, a time will start running
Within 60 seconds, press the pairing button (number 3 on the picture) on the camera
The camera is connected to the device when the live image is shown
These steps must be performed separately for each camera.