Some users (including myself) experience violent down pitching of the aircraft when in flight. The only solution, as it has been since FC 1.12, is to change ForceFeedbackEnabled from true to false in the producer.cfg file. However, this not only gets rid of force feedback on my stick, but it also removes the return to center tension on the stick.
I know of one other whose flight was unaffected by this solution and still experiences this annoying bug.