I am working on a monster 129 acre project that requires 5 batteries. I ran a test flight last Friday and only once out of the 5 flight stops did the app properly resume the map. I did not edit the map whatsoever, just stop mission, return to home, swap battery and restart. On the occasions that I could not get the mission to properly restart, I had to create a new mission where I roughly estimated where the drone left off, resulting in wasted flight time and duplicate pictures. Is there something wrong in my procedure or some other explanation for this? I have to fly this site every week, likely for the next two years.