I took my new toy p2v+ to a park to practice and learn. After doing a lot of reading and spending countless hours on YouTube I configured my phantom to Naza m and also configured the low battery return home to raise to 150 feet and return home. There's a lot of trees on the park... After flying for some time, I was notify that 'low batter' that the phantom will return back home. The phantom started climbing up to 150 feet, but just stood there. It stood there until the battery reached 2% and the only way to regain the phantom was to toggle the sw1. And of course descending 150 at 1 meter per second was overwhelming concerning. Also I do a calibration every time before flying the drone. What could have gone wrong? Why didn't the drone return home?