This morning I tried to start my 2007 c280 whaich has been sitting idle in garage for 4 days. The engine would turn but no ignition. I tried several times with no luck in starting the car. After several attempts the car finally turned over and ran fine with no issues. Since I'm new to the MB experience is it normal for a new car to not start after sitting idle for a few days. One other strange thing, since I leave the car parked in the garage unlocked, when I do use the car all doors are locked. Is this some kind of feature that I'm not aware of.

Thanks.