Game only runs when tabbed out

If I alt-tab during a loading screen, my game will freeze visually while the window is tabbed in, when I tab out onto a different screen I can hear the game running like normal, I’ve tried reinstalling, verifying integrity, checking drivers, restarting my PC. Nothing seems to be working, had this issue since I bought it and it’s really ruining the experience. If I click on settlers when I’m tabbed in it won’t do anything, but immediately after I tab out I can hear it select the settler. ??? so strange