Got the P4 a month ago. Did all of the out of box stuff correctly in my house. Got message that i was in no fly zone when i got to fly mode. I live a block from a hospital, so thought no big deal. Go to friends house a mile away - same message. Go across bay to oakland where i work and i get Gimbal Disconnected error message. All the while getting video feed. Searching forums around Gimbal disconnected message and doing upgrades and downgrades and every sequence of power-on/off order, then video feed stopped working and i'm stuck on 'How to Connect' on DJI Go App. This has been same for 2 weeks now. No iOS device connects to RC. Multiple cables used. DJI Customer Service said i was probably on the P3 screen in the app and should change to P4. No help. Is this a known issue with the USB port on the RC?