I've had this problem happen the second i put my ps4 into my DMZ to get it to a Nat Type 1. I have friends i cant play with because of Nat type and hoped this would fix it and it did. But then i keep getting the error code Np-38564-6 every 10 or so minutes. I kicks me out of my party and game i am playing if its online. This is super annoying and i hope someone can provide me with some answers as i have looked everywhere but found none. I hate having a nat type 2 and loved it when it was 1 and hope this problem is something i can fix. Also getting error code Nw-31229-7
I have looked for UpnP settings in my router but cannot find anything about what your describing. I got the problem solved now as it just took some time and port forwarding to work. I have nat type open ingame but in partys i still have isssues. Now to make matters worse my wifi connections acting up.