Looking for some help. My Sl350 started to not open in the morning using the remote. Could open with the key, set the alarm off, put key in the ignition start the car and everything was fine for the day until the next morning. Finally the key would not turn in the ignition so could not do anything lock unlock start the car etc. Keyless was also doing nothing. The consumer battery voltage was quite low (12.1v) so replaced it, the car sprung into life and worked for the day same problem in the morning, key would do nothing. Checked all the fuses and wiring seemed ok, power to the EIS so sent it off for repair. They confirmed it lost its code and repaired (£300). Got it back plugged it in worked fine for the day, next morning same thing, key wont open, ignition wont turn. Waiting to see what the repair company say but I'm unsure of what can be causing this or where to go! Any help appreciated!