Further, if you use the AI in the NVR instead of the camera AI, the capacity of the NVR is reduced.
The issue you are experiencing is you probably now are over the bandwidth capacity of the NVR. So when you disable a camera, the one that didn't load now loads.
Just because it is an 8 channel NVR doesn't mean it can actually support 8 cameras depending on your settings such as resolution, FPS, bitrate, and if the NVR is doing the AI.
wittaj is correct. I own & have installed several Lorex NVRs. Enabling AI on the NVR
seriously degrades the BW of the NVR; to the point you can swamp the inbound BW. I.E. one of my Lorex NVRs is 16 ch, 320 Mbs BW i/b capacity, @ 4k, 30 fps... but enable AI and BW drops to 200 (that's optimistic). I don't use the AI functions on my NVRs because of that, and I just didn't find them useful
and reliable enough to warrant the BW cost. But, if you have a specific need such as facial recog, then my $0.02 says get a good camera, enable desired AI features on it, and use the NVR in "dumb" mode. Lorex uses Dahua NVRs (at least all I've run across so far), but unfortunately they're deprecated versions
hamstrung by buggy firmware that Lorex will likely never update/improve (in my experience). Not putting them down, as they can work relatively well for some purposes; but there are better alternatives out there.. Wish I'd known that before I spent a LOT of time & $$, debugging Lorex quirks over the last decade (& good luck calling tech support).
I don't waste time trying to configure cameras through Lorex apps or NVR LAN web GUI. Aside from basic functions, the NVRs generally don't allow full parameter access to the cameras. Even what it does, in my experience it doesn't always work, or work as expected. I found it best to configure cameras over each cam web mngmt page, and in some (many?) cases, it's the only way to access some cam functions. In my case, I have many cams from various OEM, which amazingly most of my Lorex NVRs can access - ONCE I've config'd them up over the cam local LAN web mgmt page. However, the NVR cannot access all cam functions if using non Lorex cams (even tho ONVIF 2.4+ compliant). Amusingly, Lorex NVRs I have are not even aware that some of the Lorex cams are actually Dahua, and have extended capabilites, tho you can access via local LAN. Bought a dome cam from Andy (Empiretec) here, and it worked perfectly right out of the box on my higher end Lorex NVR... but I config'd it offline via local LAN web portal anyway. The camera is AI/face recgn capable (though does drop FPS some), and so is far "smarter" than the NVR, LoL. Don't need face recgn, just motion detection (confined area), so NVR works fine in dumb mode for me; then let the camera do the hardcore processing, if desired. Just my $0.02, YMMV