Go into your system bios and look at the temperature of your system components. It may be due to an overheating problem. Try adding a fan or opening the side panel. It may be overheating due to poor air circulation or lack of cooling. Also, try reseating all your hardware (RAM, CPU, Vid card, etc.) and see if that helps. It would also help if you supplied your computer configuration (What motherboard you are using, RAM, CPU, etc. etc.). It could be a common problem with a piece of hardware you have that can be easily googled. Let me know how it goes.