I had a similar problem that came and went and it did indeed turn out to be heat. It's not an exact and predictable problem so from something as simple as the weather being cooler or air being dryer the problem can go away. I'm using a laptop but all I did was open up the case, unscrew the fan housing over the graphics card and CPU and removed the insane cake of dirt blocking the exhaust filter.
To this day I still can't figure out why the dirt is filtered out of the air on its trip out of the case after having already passed over the chips.
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