Bose Stereo - Niggling Problem

I have a 997 TT and the Bose stereo plays everything I put in it, from MP3's to Normal CD's, no problems at all.
 
However, when I first used the car last week, the stereo showed track names and suddenly, out of nowhere, it has stopped showing track names and just says Track 1, Track 2 etc.  This is without me even changing the original shop-bought CD that it once showed the names for.
 
Has anyone else encountered such a problem and can provide a tip or two.  It is one of these really niggling little problems and it makes it worse for me because it was working once upon a time.
 
Many Thanks.