Cameras Keep Defaulting, IP Conflicts, Disappearing Cams

We replaced a customers old NVR with an Alibi/Hik NVR. They had existing LTS/Hik cams. Defaulted cams, Auto discovered most of them, changed IP stack. All good. A few days later, a few of the cameras went offline. Sent a tech. It was ip conlicts. All good. A week later most of their cams are down. Not visible in the cam config page. I have not run the config tool, yet to see if they are at all visible... but the NVR states they do not exist. I have to be missing something. use discovery tool to find cams, change IP to static, manually add to NVR. Somehow they are all defaulting. Any ideas?

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