So I was trying to fly around a football stadium yesterday with litchi. it is my understanding that with no event happening there, that this is legal. However, as the bird approached the stadium on her GS mission to circle it. It just started losing altitude very slowly, until I canceled the mission and backed up, then was able to regain altitude as I got further away again. Can someone explain this to me? I am not seeing anything in the way of a no fly zone on my "Hover" app in this area... I am concerned that if I were inadvertently fly near another unpublished NFZ that my Quad could go down if I happen to lose signal and cannot back her out... Anyone have any thoughts on this?