I agree 100% with what others have said. Practice, practice, practice and learn how the AC behaves.
Today while flying at a local beach over a frozen lake (but no longer safe to walk on) and taking some shots of the sailing club, my phone suddenly died probably due to a combination of cold weather and a low battery. My P3S was about 130m out and about 20m high. I still had control of the AC but couldn't really tell which way it was oriented. It took me a little bit to figure out its orientation but I started flying it back and then heard the RTH beep. In the meantime, my phone restarted automatically and I re-launched Litchi and it reconnected while it was auto landing, which I cancelled and hand caught.
A number of things helped me get my AC back without incident:
RTH worked as it should - probably went into RTH due to the loss of connection likely caused by lots of interference.
Was able to see my drone the whole time since I always fly within VLOS.
I had practiced RTH so I knew what to expect and what the RTH beep sounds like.
I had practiced turning off my phone to see how the drone would behave and what kind of control I had.
I had flown a non GPS enabled drone (see my profile pic) so was familiar with how to control it without GPS (atti mode).
I was calmer than I would have been if I had not practiced all of these scenarios.
Hope this helps.
Chris