Hello Mark,

When this is normally happening, it is due to another device trying to login with the wrong password.  With these systems, 5 failed login attempts with the wrong password will cause the system to not allow any other connections.  The good part about this is that it keeps potential threats at bay, while the system is still doing what it is supposed to be doing and recording.

I generally suggest disconnecting the recorder from the network.  Then change the passwords on any device that you use to connect to the device while the system is disconnected.  This allows you to change all the passwords without locking the system up.  Once done, simply reconnect the recorder and all should be good. 

Mark,

My suggestion would be to change the devices internal IP address, as well as the HTTP and TCP ports to a random number.  Then you will have to update the port forwarding in your router.  I also suggest making you an admin account for your phone and a separate admin account for your wife's phone, all separate from the main admin.  This will help you to see if either device is causing you issues.

Have you checked the password in your wife's phone or any old devices that may have had access in the past that may have been given to someone else to use?