I was playing Hexxit survival, when suddenly the program stops responding and windows starts searching for a solution. I waited a while, until eventually my computer started slowing down immensely and I had to open Task Manager and close the darn thing. It has happened multiple times since, mostly at unfavorable times. The last time it happened, when I was frolicking around a Walker castle I had just conquered, the screen the game froze on appeared to be a wood-ish texture in 3D spiky crystal form. My laptop has a history of graphics crashes every now and then, and on one occasion it went into a graphical death spiral and bluescreened. Why are these crashes occurring, and what can I do about them?