Drove car today and noticed the radio had changed to show icons for stations and temperature had changed from centigrade to Fahrenheit, updated radio and maps few months back so no idea how it changed.
Assuming you are in the UK, did the language change to French and the digital speedo change to kph? My C3 does this occasionally, no idea why, but is easily changed in the settings.
Shame that Citroen/Peugeot have never been able/bothered to get icons working for most DAB channels, rather than just on FM. Other manufacturers seem to be able to do it.
C3 Aircross Flair 1.2 110 Auto with Parking & Family packs & sunroof