lose telemetry radio connection with 3dr robotics X8

Hello every one,
I was flying my quadrotor (3dr robotics X8) several times, and the connection with my laptop was very good even at a distance of 100 metres, but recently I lost telemetry connection (433 Mhz) just when the flight begins and the distance between my laptop and the quad. exceeds 5 meters. Can you help me to solve that problem?
Thank you.

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