As a new phantom pilot I would love a bit if advice. I have a phantom FC 40 The 5.8ghz camera sending video straight to my Samsung galaxy note 2. I had my first flight today, calibrated the compass waited for maximum satellites, etc. I noticed during the flight that in GPS mode there was a little bit of drifting, even though there was no wind. I had configured the third position of S1 as "return to home", so decided to try it out, the drone came back landed no problem. The second flight I decided to go a little higher and faster, but this time releasing the sticks the drone did not return to hover, realising it was not responding I applied opposite control sticks still no response, flicked S1 to failsafe and again nothing happened the drone continued towards the ground, crash landing in some very long grass. So lucky one prop bent and a bit of lost pride but no other damage. My questions are 1. Could my phone mounted on my controller have interrupted the signal? 2. Is there a chance I have not calibrated the compass correctly, would that have caused the drifting. 3. Why didn't the failsafe kick in when it went out of range? 4. Is there anything I should do to prevent or try to prevent this happening again as I was very lucky I got away with minor damage. Many thanks for your help.