I'm trying to set up port forwarding on my router. I enter the port numbers and save them and everything looks fine as far as the "Changes successful" screen. Then when I go back to the port forwarding page my numbers have all disappeared. I tried re-flashing the firmware (which is stock firmware due to a bad brick experience) and hard resetting the router to no avail. Is it possible the router is defective in some way? One weird thing is it has saved my security preferences no problem.