They told me their signal was just fine, and I got to say that I believe them because everything works fine but FFXIV: ARR. So I'm guessing it's a server issue or something related to PSN, due to PS4 game version release.
Nonetheless, as they have thousands of ps3 players I think this issue should be addressed ASAP, otherwise many will quit the game. I've been considering that as atm I am paying for not being able to play.