I am flying in city scape and have aprox 500 meters horisontal range (not very happy about it). What is more strange is that the range upwards today was around 120 meters. After reaching 120 meters (above me, distance under 10 M) I had weak transmitter signal. Problem persist whole the flight and the test above 100 meters last for aprox 2 minutes. I decided to descent and by 80 meters the transmitter strenght was normal. It should be minimum 500 meters up in the air? No sky, no metal near me and so on. Has the last FW in controller and drone and used stock equipment and DJI GO App for Ipad mini 2.