My 2005 987 Bose system turns itself on and off continually - the CD player work on cold start but stops when the car is driven away.  The radio now does not work at all.  There is a prominent clicking sound between/behind the seats as the unit's display shows the Porsche name then goes blank.  Any ideas?  Could be a loose connection problem perhaps?  Local authorised dealersuggests replacement of CDR 24, but that sounds expensive.  Thanks!