Here comes the bump - is anyone else having problems with PSN on PS4 lately?
I'm having problems similar to those from couple of months ago - I can't connect to PSN on my PS4, and I'm getting NW-31194-8 and sometimes CE-33987-0 errors.
Since last time, I've changed my router (now I have Tenda N80 Wireless N900), and everything worked mostly fine for couple of months, but now I suddenly can't connect to PSN anymore. If I connect PS4 directly to my modem, instead of a router, PSN seems to work fine.
And this time I can at least connect to PSN on my Vita and PS3 (via router), and I can access PS Store on my PC, so I guess it's not a router problem, rather a PSN/Sony one.
I've tried resetting both the router and PS4, updating router's firmware (it was already up to date), I've tried changing MTU and DNS settings on PS4, and I've tried using both ethernet cable and wireless connections, but nothing works. Everything worked fine until September 1st, and I haven't changed any router/PS4 settings in the meantime.