"No Signal" warning?

[SinjinSix]

I took a flight last night and just about 2 minutes after liftoff I got a no signal warning. But I still had video and it flew fine. I landed immediately and restarted everything and it was fine. Is there a reason for this? Glitch or false warning? I was about 20ft from the drone.

 

[Meta4]

Quite a few threads relating to this lately.
Here's one http://www.phantompilots.com/threads/lost-signal-message-without-losing-signal.47291/