Why does my Mac Air screen keep flashing white?

I have been having a few issues with my Mac Air. Sometimes, it randomly flashes white/grey (I can still see the programs I have on). It just happens randomly and I'm getting worried....
Can anyone help?
(Please note I am most definatly not Tech Savvey so please try to simplify things if possible_

Make sure that "Screen Flashing" is not turned on.
System Prefernces > Accessibility > "Audio" under Hearing
Uncheck the box beside "Flash the screen when an alert occurs".

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