From time to time when I change CD's in the CD Changer the radio head unit states CD Error and it cannot be fixed except for my going to the rear of the truck, ejecting the changer, and reinserting it. It seems to happen a whole lot more frequently as of recent. And, sometimes, when I click the eject button for the CD cartridge to be returned, nothing happens and to get it to eject I have to hit the changer / cartridge a little and then it ejects the cartridge. Does anyone know why this is happening? Thank you.