Same here. One morning I came downstairs and found laptops vents working on full. I left it on the table in sleep mode the previous evening. Laptop was extremely hot, luckily there weren't any papers underneath. After that the fans were constantly on full, often the CPU even locked itself on 0.78GHz and needed to be restarted to stop the throttling. They then replaced the mainboard, CPU, but it seems it's still overheating.