What region are you located? 
What FW is currently loaded on the camera? 
What Mfr and Model# is the main host wireless router? 
What wireless modes are you using? 
If you disconnect the cameras power for 5 minutes, then power back on the camera, does the same thing happen? 
Set a static IP address ON the camera and see if the same thing happens. 192.168.#.25
Is uPnP and uPnP Port Forwarding enabled on the camera?