BIG MYSTERY: can't find my Phantom 4, after it did not want to RTH from a long distance flight.

Since I had a lot of signal problems at my latest attempt to fly as far as I could, I wanted to retry the flight I made before that. That is: trying to fly 4-5 km and return and see how the signal would be.
The signal was very good, but i ran into trouble nevertheless...

As usual, I put the entire flight here and it is best to watch all. If you want to skip forward to specific parts, here it is:

Canceling RTH 12:05
Reaching 5 km 12:33
Searching the drone 20:05
Aftermath 27:01

Video where I did a similar flight: https://www.youtube.com/watch?v=HF2qEVzJYc8
Video where the signal was bad: https://www.youtube.com/watch?v=vIGhiQsIdzM
Video where I got a similar error message: https://www.youtube.com/watch?v=qpuyGK39QI0
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Flight log: http://healthydrones.com/main?share=RcFhXM

Equipment list:
* Phantom 4 (buy your own Phantom/Mavic straight from DJI: http://tinyurl.com/zq35rdb)
* HDMI module http://tinyurl.com/ju9re2z
* FPVLR antenna from http://www.fpvlr.com
* NVIDIA Shield K1 tablet http://amzn.to/2kritYC
* Fatshark Dominator V3 goggles
* DJI Go app 3
* Gopro Hero 2 and 3
* SJCAM SJ4000 action cam
* Panasonic HC-V380
* Adobe CC 2017 software (Premiere Pro, Photoshop): http://tinyurl.com/hsl73zp

Видео BIG MYSTERY: can't find my Phantom 4, after it did not want to RTH from a long distance flight. канала NeverMindYourOwn