Hi Zane,
I went to fly a large project yesterday with my Phantom 4 which required about 3 battery changes. The first 2 flights were normal. However when I initiated the 3rd flight, It flew up to the designated altitude and just hovered in place and would not go to the first way point of the last flight. I landed the drone. Exited out of Map Pilot pro, restarted and tried again, but the same thing happened. Then I tried just creating a new flight covering just the last area that I needed. Again no luck. Would just fly up to altitude, hover in place and would not go to the first way point. Do you have any clues of what might be causing this behavior. This project was about a 3 hour drive for me so its pretty unfortunate that his happened.