I'm still relatively new to the DJI world, but not drone flying. I'm using a Phantom 3 Standard with iPhone 5s. I use the phone in airplane mode with the WiFi active and BlueTooth off. I've noticed lately that when I fly anywhere from 30 ft up, I would get video signal dropping in and out prompting the software to ask if I wanted to RTH. I would initiate and my copter would happily return home. This started the same day I started wearing a FitBit Charge, which relies on BlueTooth to send signals to my phone. Last night, I left the FitBit in the house, and I was able to fly with no interruptions to the height limit (396 ft.) and went out about 1/4 mile (1200 ft.). I have no knowledge of RFI or anything related. Does this make sense that wearing a FitBit would do this?