Rc signal sometimes only has 4 bars

[Bryant77]

Every now and then my phantom 3 standard only gets 4 bars rather then 5 even with the drone right next to the contoler. I turn off and restart both and sooner or later it will get 5 bars and stay constant. Anyone familiar with this and should I be concerned about something malfunctioning.

 

[solentlife]

Quite often I have 1 or even RED bars but she still flys fine. If its loses all bars - then if its the RC Control 5.8Ghz ... then RTH is initiated.

Nigel