Game crashing

I was just in a level 80 log book fighting the boss, I had previously not had any issues like this. While fighting, my game crashed completely to desktop. When I returned to the game, I was still in the boss fight, I continued fighting and quickly experienced another crash, this time it took me to the login screen for the game. I again returned to my game in the fight and continued once more, after another 10-20 seconds, the game completely crashed again and when I returned, I was in my hideout unable to return to the logbook area. I had apparently died during the crash and lost experience and an omen of Amelioration