Hello, I have a 221 s class 2006. I have a problem with the radio. When the engine is off, everything is ok. After starting the engine after approx. 2 minutes, the radio stops working, loses range and radio stations, rustles for long picks 1. After the engine is off, everything works immediately. HELP
Some interference probably won't help much but I will write in my W211 I have the same symptom after switching on the rear window heating, you would have to observe what turns on in the car at this time.
It is very possible that there is a problem with the amplifier or the antenna in the rear window. If you want, instead of the antenna on the radio, put a piece of wire and compare if it is better. It's a bit of trouble, but you have to start somewhere. If you want different advice, connect SD and do tests for radio and antenna. There are several of them there.