Got an S50, visually identical but with a 5th gen Core and a whimpy AMD discrete GPU. Worst. Thermal. Design. Ever.
It's not that it throttles. It's that it doesn't throttle enough. That it constantly runs the GPU @ 100C is terrible already, that it shuts down when playing a game is just unacceptable.
Yes, the fan is clean. The laptop is raised, vents completely free for free airflow. Still craps out. And then it's locked untill you take out the battery and power plug. Unresponsive otherwise. That was a fun moment, when I hadn't figured that out yet.