So I got the goty edition of oblivion and installed the shivering isles dlc and the game started off decent enough until I entered the mania entrance. Progressing to sheogoraths palace became a harsh task as the game kept freezing to "loading game" and I literally had to stop moving for it to unfreeze. And then my framerate was reduced to probably 10 frames a second if not less and continued to do so as I entered another "loading map" area in the open world. This happened a 3rd time and my xbox froze completely leaving me no option other than to turn off my xbox. What is causing this to happen???