Computer shuts down automatically after the old boot

I just bought a laptop last month, and always has recently shut down automatically after the start, if the use of a comparatively short time as half an hour or an hour would not have this problem, use a longer time, such as use for three hours Above will be shut down automatically after the boot problem, sometimes three times to be locked in order to switch off the machine, I would like to ask how to solve this problem?

BIOS problems ..may be cooling problem,,, CPU temperatures are high, the protection of open automatically, on the shutdown?
You should be power issues, for a try! There is also the case may be from the line! Data motherboard BIOS settings if the power is true, then the battery power supply or motherboard may be some problems you buy a book under the repair of external heat pad.Wjg888 put it right, your bios of the cpu temperature did not set well.'s Just bought Machine, the hardware should not be a problem.Or you kill the virus.If the two do not get a good, it can only find a seller.Found in the Control Panel Power Options, click Advanced Power Settings and you had Your colleagues have the same problem, you want to, then how can Coincidentally, that is certainly their own computer problems before they buy more than a month, had to find business.