Computers that suddenly restart themselves are often caused by problems with the operating system, hardware damage, or power outages. One of the most common causes is overheating of the processor or other internal components, which triggers the system to automatically restart as a form of protection. In addition, problematic drivers, viruses, or incorrect system settings can also be triggers. Making sure the cooling fan is working properly, cleaning dust in the case, and updating drivers and the operating system regularly are important steps to prevent this problem from happening again.