I had the famous dx11 crashes few weeks ago but I manage to solve the problem. It's been 2-3 weeks without dx11 problems. Here's my advices as a user of a laptop using Nvidia :
  • - If you keep crashing on the same content, reinstall the game
  • - Look at the Nvidia Control Panel, Manage 3D settings > Programs settings :
    1. select FFXIV
    2. change Prefered GPU to "Nvidia High Performance"
    3. change "power management control" to maximum
  • - Update the graphic drivers (not only Nvidia if you run two GPU) through the constructor website
  • - Update the Chipset drivers from the constructor website (I downloaded every drivers about the chipset I found on the website) <--- This point solved my problem
  • - Don't use Nvidia GeForce Experience. It causes more problems on my laptop

Sorry for grammar mistakes and good luck everyone