I was flying my P3 in a canyon area today. I was flying in IOC GPS mode. I had no cellular on my iPhone, so my wifi iPad was without a map. I had the P3 at 225ft, and I was standing 100 ft below the ridge it was flying around. After flying for about 5 minutes I somewhat lost orientation so I hit RTH. I was watching it on the iPad and I noticed it was not moving on the traceable map. The next thing I notice the P3 is at 125 and I hit the stick to take it up as I was not sure it stays at 225 from where it starts, or from where it is relative to the terrain. A few seconds later I lose connection and that was it. I never saw it again. In the past when I hit return to home it stays at the altitude I had it at and then comes down when it is directly above me. I have done this probably a hundred times. A few questions? 1 - What should I do at this point? 2- Why did it come down before traveling back? 3- Anyway to find it? No I didn't have a GPS tracker on it? 4- When it shows 125ft is that the altitude from where it started or from where it was? I estimate the canyon ridge was about 100 ft above me, and there were some 50 -100 ft trees .