I'm a brand new player and unfortunately, I've been having the same issue since I started playing 3 weeks ago. I've scoured the forums and the only thing that can temporarily fix the crashes is a system reboot. But here's what I've tried:
Rolling back Nvidia drivers
Using DX9 (still crashes a ton)
Underclocking memory and video card
Reinstalling FF14
Factory reset of computer

I'm at a loss because it's not like these problems have just appeared out of nowhere according to everything I've seen on the forums. Is there any word on anything actually being done about it?