i setup the nvr, connected my cameras 1 by 1, only have 4, they are older Dahua IPC-HDW4421MP, got 3 to work, and the 4th one wont work. it gives out an ip 10.1.1.67, shows for a split second, then says network disconnected, failed to find network host. I tried with old nvr and it works fine. Any suggestions, i just bought yesterday off amazon thru Andy.