Having the same issue. Except in my case (and my wife's case) our display driver stops responding (nVidia GeForce GTX 470). We both have identical systems. I've tried everything from drivers prior to 2.2 to the latest greatest beta. Ever since 2.2 I can tell when it is about to happen, because the framerate gets pretty choppy then the screen goes black and after a moment comes back with an error that the display driver crashed but has recovered. The game will keep running thankfully. Temps are normal, nothing in the logs. FFXIV is the only game that does it and it was flawless prior to 2.2. I chalk it up to some junk that made it into the code with the PS4 release.

Windows 8.1 Pro.