No, there is actually a dip in temperature of about 12°C when that happens. I think the GPU just stops working for a bit, hence not producing any heat.When the fan stops and screen goes blank do you see spike on temperature graph of GPU in Afterburner. Please do check. If yes then GPU is the source of problem.
I have noticed, too, that when I quit the game, the GPU temp drops from 93°C to about 66°C in less than a minute, more like 30 seconds or so.