Yesterday I ran The Tam-Tara Deepcroft and Copperbell Mines on an alt 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. I had absolutely no issues the previous day running anything but I did not run The Tam-Tara Deepcroft or Copperbell Mines so I don't know if it's just those dungeons.