Ford 6000 cd RDS EON?

My CD Radio is in a 2002 ford focus (looking at the sticker on the radio it seems to have been fitted in 06) and upon purchasing the car it worked fine, for about five mins, whereupon the buttons (including the steering wheel paddle) became paralysed and i was stuck listening to the same cd for 2 weeks. It then 'fixed' itself i.e. worked as normal for a couple of days until it became paralysed again and i'm now stuck listening to another cd again! has anyone ever heard of this happening before? sounds broke to me but i'm hopeful this is fixable!