The Inspire I have had for over a year. I don't recall ever having this issue as it's so noticeable. The p4p's were too new to me to have put much flight time on them prior to my trip. I honestly don't know if they were doing it before hand or not. No bionics. I'm not crazy right? These things are supposed to maintain altitude when moving any direction right? Could the barometers somehow have been damaged being out there?