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?