My smart (2005, 450 CDI EU Version) has problems with start-up since a few months. They occur in random unexpected moments. Sometimes when I leave the car, FE for 30 mins, it won't start. The starter doesn't even turn. Left for another 15-30 minutes waiting and doing nothing, the car usually is able to start. Sometimes also when I leave the car with engine on for a while, the engine stops by itself. OBD diagnostics proved only one error code - B1016 which probably means "CAN MESSAGE DIAGNOSIS FROM INSTRUMENT CLUSTER IS MISSING". No active lights on the dashboard when car is on. What I did is I checked the battery and SAM unit. Any ideas what could be wrong?