Brightness/Gamma issue

I appreciate that you have to start with basic suggestions, but that's not going to fix it. This is the only game it happens in. Earlier I repaired the game and when it started, it was back to normal. I played for a while, perfectly fine. Hours later, I launched the game again and the problem was back.

This is a problem specific to this game - not even other Frostbite games have this issue.

I've found it to be an issue when selecting Borderless or Windowed. I can play in Full Screen, but I'm seeing a slight monitor flicker when I do, so Borderless is ideal. I selected it earlier, and it worked. Then I alt-tabbed to another program, came back to Battlefront to find the gamma set way too high again. Tried changing between Full Screen and Borderless - gamma still too high. This is clearly an issue with the game and not my GPU or monitor settings.

Yeah, that's about the level of help I expected in here.