Not sure what is happening, but when trying to do an archwing mission, when trying to fly up, my game will not let me ascend like i should, and would do the animation of you flying up, but will keep you stuck on that Y level. This also affects the flight speed of your archwing and makes you incredibly slow. Not sure why this is happening but was told there were other individuals who had this issue.
EDIT: Found the issue. Gauss seems to just break archwing entirely