I experienced freezing only with V5. Vsync is not enabled because the game animation becomes jerky.
LFS froze my computer 2 times, both on the skid park, while watching the car with cam-behind-car, just as I hitted shift+S to go to pits, my PC froze. It was like that in the 2 times, with the BF1 and the XG GTR.
I'll try to test some more and give more input later
PS: no dusting problems or overheating.. tried to make LFS hang again, by repeating the procedure above, without success..