Please tell me how you got on with this. I have exactly the same issue, with the same DVR. Each camera used individually works fine, but together 1 camera always has colour interference sliding across the screen, almost a shadow of another camera. I have tried them all oon the same psu, and using various different inputs, but to no avail. Also the cameras with a 4 way swann guardian usb and pc had the same issue, in fact it just would not show the image and used to flag up an alarm. My next step is to try using different cabling instead, to see if that sorts it out.
