Cool story bro, but your single scenario doesn't prove anything.
There are probably two dozen things that explain your observations more than sufficiently - but overheating is not on that list.
Empirical and Entropy are my all time favourites when it comes to "Words people use without the slightest idea what they mean".
There are many, many more, but those are, by far, the best!
/Edit:
It is dead easy to check the temperature of your graphics card.
Why is it that so many people claim that overheating is causing XYZ - but not a single one of them has actually checked the temperature and can provide some kind of evidence...?
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