Macbook Pro, random white lines appear when browsing Facebook

Recently when browsing Facebook, random white horizontal lines appear across the screen when scrolling up and down.
They will mostly go away when I move my mouse cursor across the screen.
I saw another post about this a few minutes ago (dated May 8) but now it no longer appears.
Anybody have any ideas?
Thanks in advance.

Is there any way I can find out if its the cord withhout taking the screen apart?
Check the following DIY websites:
iFixit
YouTube’s “How To” tutorials.

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