2012 LG 55" - picture distorts every two seconds

[joe111671]

Has anyone seen this on an LCD set and know what it is? The picture looks normal for 2-3 seconds then "pulls" down and distorts like there's a ghost image for another 2-3 seconds . This repeats indefinitely. The top 1/16th of the screen stays normal. If it's a problem with a board, I'll start looking for one, but if it's the display then I guess I need to say c'est la vie and get rid of it. It's model 55LS579C-UA. Any knowledge is appreciated!