Date registered: Apr 2009
Vehicle: 1999 E320 4matic (owned previously); 1996 SL500
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Start with the basics. Is your battery reasonably new (3-4 years or less) or it is older than that?
If it is I would definitely install a new battery.
The other possibility is the CPS, crankshaft position sensor.
Another thing: lots of short trips are hell on engines...they don't get hot enough to evaporate water in the crankcase causing the oil to goo up and create acids that start to eat away at your block...
Make sure your engine reaches "normal" operating temperatures and stays there for at least a few minutes.
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"And you may find yourself behind the wheel of a large automobile" -Once In a Lifetime, Talking Heads
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