, are these three cameras connected to the same power source? The video shows three images flashing, but we only received two units of C20-DW—7W, which is the third camera that the other image belongs to? What equipment does the faulty cameras connected to?
Have you tried connecting the faulty cameras to other input, are they still showing the problems? Or other working cameras to those inputs, do they have the same problem? Also have you tried replacing the coaxial cable to test?