I've seen such but usually I catch the owner with the laptop playing video games or placing it on a soft surface. Take the longer warranty!
The first motherboard failed after 4 months and was replaced by a technician under contract with SONY who said this was a rare occurrence. Two months later the replacement motherboard failed and it, too, was replaced. Computer is still under warranty. SONY's solution is for me to purchase the extended warranty to protect against future failures after the 1 year warranty expires.