Hey This is just a thought, Load everything from fresh, Delete all programs on the USB drive and only load 1 voice pack, IDK if you loaded male and female. It sounds like there is a problem with the voice pack... Im NOT an expert but just trying to help....
Also if your using the HiFI make sure you use the Voice pack and if you using the Key Fob then dont down load the voice pack... I dont think that you can have both of them on there, Just one or the other