2010 S550 4MATIC. Over the past couple weeks, my radio has randomly come on while the car is off and locked. I'll hear music outside and I would have to go out and start my car and turn it back off so that it shuts down. It's been doing it repeatedly to the point that my battery is now dead. Can someone please tell me if you know what could be causing this so that I, a female, won't be walking blindly into the dealership? Do I simply need to replace a fuse or is there something wrong with the entire COMAND unit? I would sincerely appreciate it.