I got my DJI 2 V+ second hand. It has a FPLVR stage 2 kit. I had no other networks in the area and got it to 1800 feet when I got phantom connection broken. I still had the RC connection. The FPV came back on and then I lost it. When I went to my iPhone setup I could not get back on the Phantom WiFi signal. I was "unable to sign in". Any suggestions? I had perfect line of sight. This is not the first time this has happened. Once I landed the bird I could establish the connection again.