Might need to flash phone. I have a micro usb charger from Sprint that I use in my 2004 Chevy Malibu. the car charger plugs into car and phone. the reeception drops when I first plug in the car charger but after I restart the program it come in a lot better. i also downloaded fm boost. you must use that after you plug in for better sound in car. I personally have not had the issues you describe with my fm transmitter. the fm boost app is in the app manager. no extras-devel or anything. hope it helps