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Keep the laptop off of your lap. They are called laptops because of their size (as wide as your lap) and not because you can sit them on your on your lap for any extended time. This series of Lenovo laptops are very sensitive to the heat generated by the cpu and the graphics processor. If you look at the bottom of the laptop you will see that the cooling fan is in a location that is directly on your leg, when the laptop is on your lap, thus no air can be circulated to the cpu and gpu cooler. This can result in serious overheating and cause weird things to happen. You might want to consider removing or have someone remove the heatsink, clean it up and replace the coolant grease where applicable. Also blow the dust from the fan and the heatsink fins. Just remember that heat is the worst enemy of a computer