I have a wd hd 6 camera system that runs on cat 5e lines. The main box is freaking out and won't let me login, freezes any time I try to pull up history. Only thing I can use it for is live view. I want to replace the main box but keep using the camera's. Can I just pick any camera nvr box that uses cat 5/6 lines to run camera's or will there be more info needed for the camera's to work with another NVr box?