Signal lost during flight

Joined
Jun 17, 2017
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Hey, I have a Phantom FC40 and today I flew my drone but I've encountered a problem.
Before I started the flight, the transmitter blinked with red LED rapidly and there was a rapid beeps from the transmitter's buzzer, I re-activated the transmitter and then the beeps stopped and the LED showed continuous green light.
Then I took off and flew further away and then I've activated the Home-Lock mode from the S2 switch and then the indicator LED on the drone blinked orange rapidly and the transmitter, once again, blinked red and made beep noises, then I lost control and couldn't reconnect to the drone, but eventually, the drone automatically landed.
After the flight, I reconnected the battery from the drone and tried to connect to the drone, but the transmitter again was blinking red light and made noises.

Does somebody know what's causing this problem and how to fix it?
Thanks from advance.
 

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