I've noticed this happen after I've left it idle for awhile, but it does happen randomly when I'm in the middle of something. It runs a lot slower than I think it should anyway, but that's beside the point. If specs help, its running an AMD Quad CoreA4-5000 Accelerated Processor. AMD Radeon HD 8330 Graphics. I've had it upgraded to windows 10 since they gave out the free download, but this hasn't been a problem since like months after that.