Radio fading in and out sounds like another cost reduction for the 2014 Raptor year, roof top radio antenna replaced by a 3-4 foot wire hanging off the back of the radio. Walking near radio/wire antenna changes reception. Good therapy while listening to radio
As far as speakers some rigs have switches as well as fader/balance controls to direct sound to different areas of the RV. May want to check condition of that switch as well as connections on the switch if applicable.