Hello everyone ... I hope someone else has experienced my problem and can provide a solution. 
  
I have a Dahua NVR-P with support for 16 cameras.  Up to this point I had 4 cameras and everything worked fine.  I added a 5th camera to my POE system and it works great but when I go to WEB Services | Remote Devices and add the 5th camera it disappears after connecting and saving.  I tried to remove a camera, added the new one and it works fine but if I add a 5th camera (doesn't matter which one), it removes it on the list. 
  
Does anyone know why?