Last week, news broke that Metal Gear Solid V: The Phantom Pain had a very nasty glitch that would corrupt your save game file if you brought your lady-sniper friend Quiet to mission 29 and mission 42, forcing you to start the game over from the beginning.
Early this morning, Konami had released an official patch for the PS4 and PC that has effectively killed this bug, making it possible to bring Quiet into all possible levels without any save glitches. Konami Europe did advise that the other consoles should be receiving an update soon.
Until then, Konami has advised to not bring Quiet into mission 29 and mission 42 in Xbox One, Xbox 360 and PS3 versions of the game.