I just bought my Phantom 3 Standard during Black Friday, turned on, updated the firmware and since its on come up with the warning about strong interference. Have changed places and nothing changes. Moreover, when the drone reaches 500-600 m it comes back home due lack of connection with control. Very frustrating. Can you help?

I just bought my Phantom 3 Standard during Black Friday, turned on, updated the firmware and since its on come up with the warning about strong interference. Have changed places and nothing changes. Moreover, when the drone reaches 500-600 m it comes back home due lack of connection with control. Very frustrating. Can you help?