just wondering if anybody on here could shed some light on my sat nav system. When starting up first thing, i keep getting 'cd reading error -try another disc'. However, after travelling for 20 mins or so and turning ignition off approx 3 or 4 times it rights itself. At first i thought the head needed cleaning so i bought a cd cleaner but this has not rectified the problem. It seems as though the unit needs to 'warm up' before it functions ok. all other electrics are fine. please dont tell me i need a new comand unit !:-( :-( 
