Good afternoon and thank you for posting on the Final Fantasy XIV Technical Support Forums.

I'd like to get some more information about this crash.

When exactly did this start occurring and has anything changed on your PC that coincides with it?
Do you receive any kind of error message when it crashes? Can you post a screenshot of it?
How far do you get into the game before the crash occurs (if at all)?
What have you done already to try and resolve the issue?

We hope we can be of assistance in helping you enjoy the exciting world of Final Fantasy XIV!