Sony 5 disc cd reading issues?

I have a Sony 5 disc cd changer. Suddenly it has quit reading the cds. Currently there are 5 discs in there, none have I had a problem with, and when the disc is selected it attempts to play it, but eventually it moves to the next disc and says "No Disc". The changer is 5+ yrs. old, but I've had no problems and suddenly it has just stopped working.