I've had a couple of freezes recently on my system seemingly when AIM-9s hit enemy aircraft. I'd set up a fast mission and edited it to be AI only. I watched a couple of A10s engage a flight of SU-25s and the screen froze twice during AIM-9 explosions. Note frame rates are otherwise high (30+ minimum), 1920x1080, graphics settings are high.
System is i7 3770K at 4.1 GHz, 16GB RAM, GTX570 1.2 GB. Latest Nvidia drivers.
Note I could use CTRL/ALT/DEL to close DCS and return to main menu.