Two Straight Dungeons with Repeated Crashes at the Final Boss

So yeah... I just ran The Tam-Tara Deepcroft and Copperbell Mines and everything was perfectly fine in both instances until the moment we engaged the final boss. Both times right at the last boss I began crashing to desktop and every time I would get back in the game I would crash again until after the boss was defeated. I crashed immediately upon engagement with approximately five to six crashes on each boss and, again, it did not stop until the boss was defeated. Anyone else experienced anything like this or have any idea what in the world could be causing it? I had absolutely no issues yesterday running anything.