It did sound like it was rebooting all the time but has stopped reading cds altogether now, however the radio is working fine..the wiring hasnt been messed with, and it was just a out of the blue problem. I have managed to get hold of a RCD510 unit, so i'm going to install that later in the week and see if there is any other problems.
how did you re-wire yours for a permanent live...I have got no idea about this sort of thing :(