I was reviewing a Litchi waypoint mission flown with my P4 yesterday when I noticed the speed dropped well below the 12.5 mph cruising speed I had set. I created this mission using a P3P last year and it flew the same route at a relatively constant speed. I don't understand what's happening here though. The only thing I can think of is Smart RTH. During the flight I experienced a few "Downlink Lost" messages. Could this be the culprit? (I didn't bother disabling the option in the controller) Because I make heavy use of waypoint missions, this is a serious issue I need to get a handle on. The first drop in speed occurs at 1m 27.7s into the flight.
DJI Flight Log Viewer - PhantomHelp.com
DJI Flight Log Viewer - PhantomHelp.com