I'm playing bo2 zombies on map Origins. After some time the game minimizes itself and isn't reopening. I did the rl_fullscreen 0 and vid_restart commands and it still doesn't work. The only solution that ever worked was restarting the game. Which in a map like Origins, isn't really a good solution because progress will be wiped off such as Staffs and Rounds.
(Just note though I have a ancient pc like a Intel HD Graphics 4400 so that might be why.)