Games Completly crashes my pc

I play bf6 on a desktop and a laptop. On my desktop which has a 9800x3d, 32 gigs of ddr5 ram, and an 8 terabyte ssd, and a 5070ti. When im in the battlefield six game. If I hit the windows key to back out and log in to discord or check other apps in the background my desktop screen goes completely black and my pc crashes and automatically restarts. I do not have this issue with my legion 5 gaming laptop which is wierd. If I dont hit the windows key the game works fine. Wondering if you guys could figure out the issue.