I have been flying this morning about 30 km from home. Very nice flight no problems. When I got home did an other flight and got the message: 'weak rc signal' standing right next to the P3A. After starting everything up a few times the message disappeared. A flight later I got 'disconnected on the iPhone. Had to boot the phone to get 'save to fly'. How can I get a low rc signal? No interference in the area.