Matthew has an Asus laptop and it restarts from time to time. Leo says that it's crashing and shutting down to protect the hardware from damage. Leo suspects that it's overheating. Matthew can remove the outer case and clean it out with a vaccum cleaner or blower. A fan may also have stopped working, especially one for the CPU. If the thermal paste that attaches the fan to the CPU has dried out, that could be causing overheating issues as well. A flakey power supply is also a possible culprit. Leo suggests finding an independent computer expert that can fix it.