On a long run this morning, so i decided to put the cruise control on. pressed the set button and the digits on the cruise control just kept flashing. so i turned it off and on again. same thing, then the next time i tried it, the service light comes on. i've only had the car 5 days. Is this a common fault? People warned me that all those electrics in a Citroen was asking for trouble. Hope they weren't right.