Land Rover Repair: Radio, fuse box, navigation unit

Question
I have A 2003 discovery HSE with the navigation radio. Lately the radio will display the LAND ROVER at start up as normal however the radio will intermittently turn off for a split second then "reboot", if you will. And once it would not shut off after the five seconds or so when you turn off the truck. Now is the radio the problem or is there a small relay of sorts in line of it?

Answer
The radio navigation unit is powered by several fuses and the accessory power relay. The relay is located in the engine compartment fuse box with the fuses.  There are also relevant fuses in the passenger compartment fuse box.  From your discription, however, it seems more likely to be a problem with the radio navigation unit itself, rather than one of the fuses or relays.