U disk desktop or restart the patch, what's the cause?

Users questions: Our company has a office computer or restart the patch U disk, reinstall the software system is still valid, and no signs of the virus, hardware, what factors might cause this problem? Motherboard is ASUS P4B800. According to him about half a year before the computer is still very easy to use; However now the problem here, one can not take U disk, 10 have 89 will be reset; the other is power-down reboot for no reason, and sometimes he is drawing, not save the job halfway, a sudden power-down restart the computer, are all bitter! ! Do not touch moving cable. To ask you, most of these problems is what factors lead to?
Experts answer: such a problem, factors of production should include: 1. Power supply Unstable power supply. (There may be mains voltage instability, could be equipped with a UPS power supply for the computer, it could also be caused by poor quality console can only be replaced) 2. Memory of poor quality. (This is my own past, through no rules automatically restart) 3. Short-circuit USB Interface Phenomenon, as long as a connected device that is caused by short circuit, cause the computer to restart.
  • This information provided by the users.Thanks!