Ok so running dji go or dji go 4.0 in city wow. Video feed cuts out full hd bars full controller bars. Now this hasn't happened in previous app versions. It seems like what ever they did to the latest apps it's always hunting for a new channel. Setup Ipad mini 4 no apps installed except dji go. Drone phantom 4. Controller modified or unmodified same problem. Un modified stock controller switch to manual pick a transmission channel problem goes away. Modified controller amplified more range stronger signal with dbs mods 2.2 panel same problem. Switch to manual channel problem solved. Read again    "full hd bars full controller signal"

3000 FEET AWAY channel hunting begins. Video quality degrades and so on.. And with the stock controller before I was able to get 1.5 to 2 miles away no video cutting in or out before your latest app updates now we are stuck with this. The modified controller maxxrange dbs mods 2 smaller panel or the larger panel  with amplifiers. Well over 3 miles in city in and out video feed with full hd bars and full controller bars. Switching it to a manual channel on either controller fixes this crap.