Guild Wars 2

So path 1 of Cof, run goes smooth and we get to the boss and I am experiencing no lag or anything that I might construe as uh-oh. A mere 20-30 seconds left on the boss’ health and out of nowhere my machine resets. A little frustrated when I return because everyone in the party has said their goodbyes and left and I am standing outside CoF with no loot/tokens and the path closed. I jump straight back in to CoF path 1 and the run goes just as smooth as the run before. We make it to the boss and once more, 20-30 seconds before the boss drops my machine resets! Log back in and once again everyone has said bye and left and me with no tokens or loot once more.

Is anyone else experiencing this glitch at all? For knowledge, I have been playing for several hours every other day, no crashes before and I can run both GW2 and Skyrim set to high so I do not believe it is my machine.