Battery drain...
My 92 400E had that problem. I finally traced it down to one of the radio amps in th trunk on the passenger side. What you have to do is hold your hand on each of the 2 amps after letting the car cool off for a while. Then, if one on them is still warm after a while, then that the culprit. To stop the drain you simply unplug the electric going to it.
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