I did have problem with glitch and lost of signal back when I was still playing G4S, I tried both Pro and none Pro Spektrum Rx with hand-build full charged battery as well as stock battery from G4S. glad G4S is a tank else I will have to spend awful lot of money to repair it.
My friend's Mongoose has no problem at all and my current Mcar has no problem either. now I am suspecting it is the position of the Rx is the root of problem.
I never have FM radio in it so I have no idea is it just spektrum or radio overall