All of a sudden out of 5 cameras installed, 1 does not work at all, one works but only black and white images, as if it was in perennial dark mode (but the room is illuminated) and 1 now is images only, no audio. Very frustrating, as we use them to monitor elderly mother living alone 1000+km from us. She tried switching on snd turning back on but no improvement. The cameras are less than a year old snd all worked to start with... just suddenly developed all these faults. Talk about planned obsolescence...?