Hi im having trouble with my radio on my car, it wont read burned cd's or original cd's, it does read them but i have to insist a bunch of times, about a year ago it read anything with no problem, its a normal radio, it doesnt read mp3, its the volkswagen jetta 2003 custom radio. Is ther like a manual to fix it? do i have to clen it? how do i do it? the lens doesnt work anymore???