Audio Systems: bmw 528i radio problem, bmw 528i, radio problem

Question
I recently bought a 1996 BMW 528i and the radio is really weird.  When I turn the car on the radio automatically adjusts the bass all the way to the left (max base), and the balance automatically adjusts to the left. If I turn off the radio while the car is running it will remember the settings (which I have to manually readjust every time I start the car).  The radio is the BMW autoradio business which came with the car(cassette model).  As far as I know there were no modifications to this.  Any help would be greatly appreciated.  

Answer
here can be many problems and you have to check them and let me know
do you have DSP ?
are all the tail lamps working ?( they work with the IP-BUSS ) of the vehicle
is the radio display flashing?
what type of cd changer you have in the trunk ?