Macbook screen goes few seconds to black screen

I didn't use my macbook for couple month and a couple days ago I did an software update. Now I was working yesterday on the macbook and my screen turned 4 times to a black screen. It was while i was working on the internet or on a word document... the computer don't turn off but only the screen goes black for 5-10 seconds. after clicking or something else the screen goes back to where it was.
Can some one help me please?

And when the Macbook goes back to the normal screen it makes the same sound as when the computer goes from sleeping mode to normal...
Hope that some one can help...
Thanks!

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Macbook screen goes few seconds to black screen

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