Hi, I'm having some problems with my Jato 3.3 TQI

I turn it on and I can ran in small locations (about 10 meters). After this, the car loses signal and receiver flash red. When I came near the car the signal came back (receiver in solid green) and I can control the car again.

My batteries are new and I replaced it again for another new pack of batteries (in car and control).

Somebody can help me?