Most of the flight seems quite normal but there's something interesting going on in the last few minutes.
Your Phantom was 980 feet above your homepoint which was at about 463 feet ASL
At 1440 feet ASL you were at about the same level as the highest point of Mt Cooroora.
At 13:12 your Phantom lost video signal for 1:37, video was restored but lost again for 0:42, 3:19 and 0:09.
Video signal was restored at 19:04 but your battery level dropped from 40% to 27% while this was going on.
The loss of signal must have been because your Phantom was being flown around Mt Cooroora from your home point and a chunk of the mountain was blocking the LOS between the controller and the Phantom.
That you didn't lose control signal suggests that your Phantom was right on the edge of dropping in and out.
The Phantom appears to have had a clear line to fly RTH, about 60 metres north of the highest point of the mountain.
If it did RTH along that line, it should have had nothing to hit on the way.
The puzzling thing is that the flight record indicates the Phantom was in RTH from 14:49 till the end of the record at 19:04 but it's position did not change at all during this 4 minutes 15 seconds.
After that there is no record, presumably because the mountain is blocking signal again.