Hello.
I have the same problem since the patch. Meta event with squad, random crash with a lot of people where the game freezes for 1 to 3 seconds, and back to desktop without any error message.
I am not using the direct x 11 beta, and my machine is older than yours. (Geforce 660, i7 CPU 920 @ 2.67GHz, 12gb RAM, W 10 64 Pro).
Never had this kind of crash before.
(Sorry for my english, i use Google translator)