C230 Kompressor-

Last night while driving I noticed the message box was blank where it usually lists the radio station I am listening to. It didstill say"audio" at the top, just no channel.The buttons on the steering wheel to control the volume and change the channel didnt work while in this mode. This was troubling, but I can deal with hitting the radio faceplate to change the channels. the real problem was when i turned the car off, took the key out and open the door. the radio continued to play.

i turned it off with the power buttonhoping this wouldnt kill my battery. the vehicle did start today and seemed to run well, but the radio continues to play with the car being off. could this be a fuse problem or something more serious?

thanks