|A. In Control Panel, check your power options. I should ask what OS you are running? XP ... Vista, Win7? and is your OS 32bit or 64bit? If you go to Control Panel - System icon, it will indicate OS and type...|
Your power settings may indicate "system standby" for a short period of time.
B. You may have a virus.
C. You may have to have a reputable Computer Repair firm perform a diagnostic
to see exactly what is wrong. Try www.computeroutlets.com
best of luck Tom