Every program will eventually fail and lock up for some reason. Normally, if this happens and you need to close it and reopen or just move on to something else, and the built in close function doesn't work, you can just go to task manager and kill it there. But if it's fullscreen, it will often refuse to give up the screen when it locks up and effectively take down the entire computer.

This is why AoS needs windowed mode specified in the configuration.

1) Don't make misleading titles.
2) This is a suggestion forum, not a bug report, so make the suggestion the center of attention.
3) Use search next time you gnome.