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The "fine at first, then getting worse" thing makes me wonder if it's heat related. I think I'd first take an air can to it and make sure all of your fans and vents are nice and clear if you haven't already done that. Does your mobo have CPU temperature readings in the BIOS? If so, go straight in there right after it does it next time and see if you're cooking your CPU somehow. You could install some software to monitor that in real time as well, though it's honestly been years since I've looked into specific software options, so I can't help much there.
I do agree with others that the power supply is the most likely culprit though, so be sure to blow that thing out well. If all is clear and your CPU temp is fine, but you're still shutting off, try a new PSU. If that's not it, it's gonna get tricky.
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