NC/Mk3: Bose 6 disc changer sometimes doesn't recognize CDs

[TNurburgring]

My NC has a Bose 6 disc changer in it. Sometimes it randomly turns off when I am listening to a CD. Then I turn it on again and it will say "NO DISC" when I try to listen to my CD. After some minutes you can hear the CDs moving in the Bose 6 disc changer, then I recognizes the CDs again. Other times it won't do that and I have to get the discs out of it and put them in again...

Does anyone know what the problem might be?