I tried it again today.
Same thing random screen flickers white.
I decided to close the game and hit Alt+Tab to a small screen i had open and i noticed the flickering stopped with the game in the background.
Each time I had a new screen like picking my hero or going into the game it started flickering but if i tabbed out and back it stopped.
I was able to play the game and noticed it only flickered once in a long while and would stop after just flicker. Not sure what caused it but i will try keep an eye on it.