Went to my buddy's to show him the quadcopter and lifted it up over Oshawa, Ontario Canada. I've gone way higher than this without signal loss but today it went into fail safe mode and returned home. Unfortunately there was limited space in the backyard and the tree's canopy basically covered the whole yard. Later I noticed an airport in the distance! Is it possible it lost signal from being in their air space? Please share your thoughts as why this UAV lost it's signal. Thanks for your input, much appreciated!