Game has dark screen after my screen saver comes on

What you were expecting to happen, and what actually happened?
I expected that when i came back to my computer, i could finish my match on GOW.

when i got back to my computer, the game showed a black screen, i could click and finish a match but had no idea what i was clicking on (was in treasure map that time)

What are the steps to make it happen again?
let my computer go to the screen saver (i have to have a password auto set for after 10 min idle)

Do you have any screenshots or video you want to share with us so we can see the problem? Attach them to your post!
i might be able to get one later.

i have ultimate windows 10 fully updated