T410s shuts down abruptly during CPU-intensive tasks when plugged in

Hi, my ThinkPad T410s (2901CTO) has been shutting down whenever I try performing some calculations in large Excel files.
I tried running the "Stress Test" diagnostic that came with the ThinkVantage toolbox and it failes within several seconds of playing the video. You can see the frame rate go from 30-something come to a crawl and hear the fan noise increase and then the system shuts off.
I read a lot about issues with the switchable graphics so I tried updating the Nvidia driver and even disabled discrete graphics altogether but the problem persists. During regular usage there is no discernable problem; the issue only occurs when I appear to be "pushing" the processor (whether CPU or GPU, not sure) to the max (such as when Excel indicates all 4 processors are being used and the percent completion for a formula calculation increases extremely slowly).
I tried running the "Stress Test" diagnostic while using the battery (set to use integratead graphics in power options) instead of plugging in (which is set to use discrete graphics) and it was able to finish successfully. So I am guessing my problem may have something to do with overheating but I really have no idea.
Thanks in advance for any help.
Samir

From HWMonitor (now):
Lenovo 2901CTO
THM0 - 51 C
Intel Core i5 540M
Core #0 - 41 C
Core #2 - 46 C
However, when I tried running the Lenovo stress test I noticed that right before crashing the temperatures were hovering around 80 - 100 C (including graphics processor).
Thanks,
Samir

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T410s shuts down abruptly during CPU-intensive tasks when plugged in

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