My macbook keeps logging me off unexpectedly while I'm using it. What do I do to keep it from doing this?

When I'm using my macbook pro, the screen just turns black all of a sudden, and then after a while, it lights up again, asking for my password so I can log back into my computer. It's not due to inactivity or anything. Do I need to change my system preferences or is it a virus? Please help!

Have you completely shut down the computer, waited a few seconds/minutes, then turned it back on.
There was a similar post the other day and it ws because the user never shuts his computer down. He aways put into Sleep mode.
Here's the link to that thread.
https://discussions.apple.com/message/16966163#16966163

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