game shutting down.

i log in perfectly fine and my character is ok. but this has happened twice so far. i get kicked out the game. a system message pops up saying FFXIV has stopped working and then it tells me to shut down program. i try and log back in and when i go to choose my character it goes to the now loading screen and then it shuts down again. i will try and try again for hours but it will not let me back in the same thing will happen over and over. i am only able to get in the next day and it happened to me again just now. please help me or shine some light on what i need todo.