Steam user here, PC on Windows 10.

I've been having a problem since the last patch- without any crash window afterwards or warning (or change in gameplay), FFXIV is instantly and seemingly randomly closing down. Today alone it's:

1) Dumped twice during a Mt. Ordeals trial.
2) Idling in the Gold Saucer doing absolutely nothing.
3) The middle of a cutscene getting a Splendorus Tool (the weaver one).
4) Running down a hallway during Crystal Tower
5) ...and during the Behemoth boss for good measure
6) Standing in the middle of Gridania next to the Carpenter's Guild.

Is there a known issue with the current version that could be causing this?