Why does the display brightness surge and dim repeatedly?

Periodically, i.e. frequently (about 2-3 times per week), the display brightness surges - dims significantly, then surges to ~60% full brightness whether on battery or adapter power.  As I write this note now, it is running with the power adapter and the brightness has been surging since I turned it on about 30 miins. ago.
The battery indicator is showing 98% charge. 
Over the past month, as this has occured, I've tried several variations of the power parameters, but with no affect. 

I'm replying to my own question above.  A few minutes after I posted the Question, I noticed another question in the Community in regard to "systems preferences, display, brightness, etc."
I then opened my "System Preferences, Displays", and, as the brightness continued surging, unchecked the box "Automatically adjust brightness". 
Voila!  The surging and diminishing brightness issue STOPPED.  Over the past several minutes it has not returned.  Piece of cake?  Time will tell.

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