Make sure the fan on the card is working. Test your card on a completely different machine before taking it all apart. And you mentioned it's happening quicker now so I'm guessing the chip is reaching the limits of it's thermal envelope faster what with ever-hardening thermal grease.
Even a moderately heavy game crashes the card in a few seconds flat. However, I had already done irreparable damage to the components and now my card is only good enough for desktop usage. I ended up frying the chip and after I realized my mistake I again removed all the grease and applied pea sized portions to each chip. The thermal conductivity of thermal grease is more than air but still much less than metal on ceramic contact. The function of thermal grease is to fill up microscopic scratches and air pockets on the surfaces of both the chip and heat sink, thus ensuring firm contact. However, I didn't realize you had to use a pea sized amount and ended up covering the chips with copious amounts of grease. I removed the grease using a commercial grease remover for electronic components and purchased a fresh batch. The solidified thermal grease was now actually acting as an insulator rather than aiding in heat transfer a sort of blanket if you will. The excessive heat had completely burnt and solidified the thermal grease between the processor and memory banks and heat sink.
When I realized what had happened I had to take apart my graphics card's heat sink and fan. I hadn't noticed that the fan had stopped working and in seconds my screen started flashing and my monitor kept resetting and finally I got a blank screen. I had the same problem with my nVidia GeForce 4 Ti 4200. A graphics card processor can easily jump to above 100 degrees centigrade with no cooling. Yes, it's definitely an overheating problem, and yes if the fan on your graphics card has conked out your chip isn't going to last very long.
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