Well that was a baptism of fire. I stick usually stick to the rules explicitly but as i was flying over agricutralland I have permission on and was trying to do a POI but the sweep went out my 500m so I returned changed my battery and then went on the same mission and changed m range from 500m to 600m mid flight to 600m. It was fine so I continued then when I got to 1900 ft horiz and about 150ft vert I had a lost connection error. I didn't know if it was the lead or what. I had no control but I did invoke the RTH on the controller and it said returning home or something to that effect. I then paused button to see if I could get the connection back to the CS Ultra but no joy so I pressed RTH again on the controller and when it was home i took over and landed it manually. Can someone tell me what happened. I had not info on my flight log on the CS but maybe it is on my Mavic SD card. There is nothing under LOG folder only IDX has 2 files THM has 23 XCODE empty. What files are needed to analyse it?