I used to use my Nexus 7Gen 2 with no issues except for brightness on a sunny day. I now use my Samsung S8+, easier to use and much easier to see in the bright sunlight
Ok so definitely not as good a video as most here but this is my 2nd attempt at follow me mode with Litchi, still working some exposure issues but I'm pretty please with it,
As previously stated, all you need to do is add a couple of waypoints between your longest leg. It happens to me a lot, especially on long straight line runs.....throw in a waypoint or two and you're golden.