I have a problem with my phat noise in my Seat (vw system ) its in the glove box and when on for over an hour or car left in sun to get warm the sound starts to crackle then it will cut out to radio.If you try to go back to phat noise play you get CD or magazine in radio display or it will come back on but still with crackling to the sound .Has anyone had this problem I'm thinking of a possible cartridge/hard drive problem .Should i be looking to replace the drive and can anyone recommend a good on to use thanks Al