You need to change your PS4's DNS settings to fix this.
The link above provides some of the settings that might work about halfway through the page. I had to do this for the last patch, and it took me a little while to find the right combination. I am sure that I will have to find a new one when Stormblood drops.
Watch me bash my way through Vita RPGs at http://psvitarpgs.blogspot.com
Currently playing: Tales of Hearts R