Its just a video card problem. (its a pain in the you no what) If you work with 2 panels side by side and have one your work area and the other your hypershade it should help out a bit. It fixed it having 2 panels at school when the same thing was happing to me.
Hope that helps
I am enough of an artist to draw freely upon my imagination, knowledge is limited, imagination encircles the world. (Albert Einstein)
https://www.artstation.com/kurtb