I have a Dahua 3M dome camera (HDB4300C) that had been working fine for a few years, then recently started having image quality problems. Colors are off and image pixilated. If I go in Setup/Video/Video tab and select default (reset Mainstream/Substream to default), the problem is gone for awhile.
I tried replacing the camera, new one does the same thing. I tried replacing my PoE switch, same problem.
Weird thing is when there is an motion event, the problem goes away until the motion event ends, then the colors go black/white and image is horrible for a few seconds, them back to just poor image/colors.
Any idea what might be happening? I can't imagine I have 2 defective camera.
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I tried replacing the camera, new one does the same thing. I tried replacing my PoE switch, same problem.
Weird thing is when there is an motion event, the problem goes away until the motion event ends, then the colors go black/white and image is horrible for a few seconds, them back to just poor image/colors.
Any idea what might be happening? I can't imagine I have 2 defective camera.
![poor image quality.jpg](/data/attachments/27/27878-f74c92b10f778e13f20065424873b812.jpg)
![worse for few seconds after motion event.jpg](/data/attachments/27/27881-1c3aefd1f9995dc90c2a5c3f71a8afe3.jpg)
![](http://[url=https://ibb.co/hahGH7][img]https://thumb.ibb.co/hahGH7/1.jpg)
![](http://[url=https://ibb.co/hahGH7][img]https://preview.ibb.co/bBdqc7/1.jpg)