My AMG S55 has lost the radio sound it constantly scans for signal,and phone does not work, states Phone error the command sat navworks but no sound from the voice command, it started intermittently sometimes it worked then it did'nt, i suspected the ignition key but i may be wrong, also if the car is parked up for about three days the battery runs flat, i have replaced this with a new one but it seems that something is running it down but i cant see anything on, i have checked the obvious boot light interiors ect, when the battery gets low the alarm will try to soundshe is very low milage 30,000k for her year can anyone help me please.

 

As far as the battery is concerned, you definately have a current draw. Check the alarm horn, and the OCP. (over head control panel)
radio concern, check the antenna. It might be the antenna splitter.