Buzzing RC

[Petiebear]

I just set up my P4 and am practicing on flight simulator and the controller started making a series of buzzes.
Anyone know what this is. I have played with the simulator a few times and yhis never happened.
Thanks in advance

 

[Neon Euc]

Ant chance of a video to see if you have an extra camera to do that

Neon Euc

 

[Petiebear]

I charged the drone battery now all is ok. I had 50 percent. Weird.