To preface, I was pulled away from the game for 10 minutes. I was at the end of the final act 3 mission right before you fight the final boss and was sent to orbit. Now I have to redo the whole mission because I "wasn't active" in this single player mission for 10 minutes. That's funny because I can step away from the game for like 2 hours while in the biggest social space in the game (the tower) and never be kicked to orbit or out of the game. Please add checkpoints to non-matchmaking activities so that we're not forced to redo a whole hour-long mission.