As mentioned couple of times before, probably due to dust or overheating. Fans wear out over time, and it might need to use more processing power for more recent games, hence it's not able to cool down anymore.
My first generation PS4 is like a leafblower when I played God of War or Red Dead Redemption, same issue.
Free online play.
PS2 games *(early versions or hacked versions only)
It will play pretty much every format of video/photo/music you can throw at it.