Blaupunkt nx radio/satnav

[xdazx]

Hi i have a 57reg mondy i got it with the the standard 6disc cd and built in satnav but over the last few months its developed a problem every so often the unit just turns on and off randomly with the radio or cd on and the satnav wont work it just keeps searching does any1 have any ideas ?? Or does any one have a blaupunkt nx satnav disc orcomplete unit for sale cheap :) ps im in leicester area

cheers

daz