I am not sure what caused this but the best I can assume is nvidia driver update.

PC froze on any circumstances in game- loading screen to Gridania, in my housing, in Limsa and in battles.

I tried to restart pc in safe mode but pc totally crashed on windows login page. So I had to format pc.

Gladly I installed ffxiv on another hard drive, played the game without nvidia drive then it worked fine for 2 hours without pc freezing.

So I am gonna reinstall older version of nvidia driver. I hope it won't cause any problem! Fingers crossed.