This was the only part of the movie that totally did not work to me, because the way they depicted it was that the gravitation of the earth correlated with the direction in which people fall, not as a malfuntion of the artificial gravity. And if it is a random on/off malfunction, this would only cause people to bounce around a little, which would look clearly different from what was shown in the scene. If they are in free fall, the microgravity would not give rise to the dramatic forces in that scene. If the friction of the earth atmosphere was supposed to cause the fluttering and rotation of the ship, they would already be incinerating. Anyways it seems an unlikely weakness of such an advanced vessel not to be designed in an aerodynamic fashion that avoids such dramatic fluttering. Otherwise I enjoyed the movie.