Hello, I'm new to the forum and this is my first post.  I have this system from AMCREST: https://www.walmart.com/ip/Amcrest-AMDV960H4-4B-Video-Surveiilance-System-500-GB-HDD/44786726 Two of the cameras are basically useless at night. There was another camera that was out all the time at night but it randomly started working again and that's when two others went out. This makes me think there's some kind of power issue. I don't think the cameras are broken. They are constantly flickering with a "NO VIDEO" screen or completely dead with "NO VIDEO". I asked in the AMCREST forum but I could not resolve the issue. I tried plugging in of these non-working cameras to an extra power supply I had (12v 2amps, like the ones included for the cams and DVR) directly instead of using the included splitter but that didn't help. I'm not sure if there's anything else I can try with these cameras. The one camera that has always worked perfectly is on the other side of a wall from one that never works at night. The distance from both of them to the DVR is basically the same, in fact I think the one that always works is further away. Any suggestions? If not, what I can I buy that is better than this? I installed these myself, drilled all the holes and ran the cables, it was quite tedious. I would like something that records 24/7 and allows me to watch through an app like this system does. But I need reliable night vision and better resolution (this one's image is sub hd). Thank you