sounds like the energy saving features, when your computer's screen saver kicks in, it mgiht be doing it instantly or waiting XXXX amount of minutes etc, but sometime the computer itself is going into a standby or "sleep" mode.
Right click your desktop, properties, screen saver tab, then look for the energy saving and once in there see if your machine is set to go into a sleep mode or standby, my best guess would be this is what is causing your problem.
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