This is the error I'm getting when the game crashes:

An unexpected error has occurred. Exiting FINAL FANTASY XIV.
2018-07-06_04:39

ffxiv.exe+24BBEA
ffxiv.exe+DE0EDF
ffxiv.exe+25E0EB
ffxiv.exe+2B344C
ffxiv.exe+2B6DF5
ffxiv.exe+133C32
ffxiv.exe+132A55
ffxiv.exe+15646F

At first I thought it was because of DirectX11, but this crash in particular is from the DirectX9.0c client.

The game has been crashing ever since the HoH patch.
I don't have a history of the game crashing either, so I find this highly irregular.