Sadly no. I wish it were that, but I fear its much much worse. My PC could be defective or something, and I'm just now noticing it. Weird how its only on planet zoo where it smells like this though..
See to me, without knowing what temperatures you're running at for each piece of hardware, I'd lean towards saying that this is a CPU issue over GPU.
The Planet series are far more intensive on the CPU than other games are and if other games run fine without any issue then it could be your processor overheating.
You really need to look at those temps and post them buddy!