I have an Arris TG2482A modem in my house which I have been using for quite a while now. I like to play multiplayer games on my PS4 and at first I didn't have any problems with it; I'd get a NAT type 2 or moderate. But overnight my NAT type changed from moderate to strict, and now I can't play most online games anymore. I tried enabling UPNP and port forwarding but to no avail, I still have get NAT type strict. As far as I can gather, port forwarding should be enough for me to get NAT type moderate. Does anyone know what else I can try?
I also tried activating DMZ for my PS4's IP address band that unfortunately didn't work either.