The gfx card overheating can 'cause your computer to freeze up. Do you have spare parts? If you do you can swap them for your parts one by one to determine the problem.
You can also try this if you think it's your video card. Take out your video card and take off the fan. Clean all the dust off it. There's usually a little sticker covering the axle that it spins on. Take it off and put a bit of light grease on it to lubricate it. I used oil myself 'cause I didn't have any grease and that worked fine but I was told to use grease. Just don't put a lot. Even one drop is too much. Use a toothpick or something to apply it.
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