Just yesterday I was out flying park where I usually fly kind of out in the country, I had put together a way point mission with a round about flight of about 3.0 miles, everything was going fine then I started to lose control connection, I figured regardless it will complete it's mission and return, I was about a half of a mile or so in distance away and only flying an altitude of 196 ft. and a lot of trees between me and the P3 Adv. so I waited and every few seconds I got an update on the flight data and seems it was just hovering somewhere, Now I'm beginning to become nervous, so we started to walk in the last direction it showed on the map for it's location, I had already tried RTH on Litchi and nothing happened, we kept walking in that direction, finally after a 100 yards or so of walking I tried RTH again... battery at about 53 %... then like magic the app voice says Returning Home and starts giving me live data again and a speed of 22 mph, she's coming home, shortly we could hear that beautiful sound of the props overhead. This was my very first scary situation for sure, But she made it home and that's what counts. I think maybe if my Altitude would've been like 300' ft. or so I might not have lost connection, but since my altitude was only 193 ft. with all the trees it was not reaching the P3 adv.
The Moral of the story is DO NOT Panic, keep cool and use your head.. and more then likely everything will be fine !