Don't shoot it, Just threaten it and shake your fist.
My guess is there is some power draw when its off. perhaps a switch or something is left in the on position slightly or not disengaging, How to pinpoint what it is will be hard.
I would just start from one side and work to the other checking all contacts and switches and cleaning them, at least you wont have to do it in the future and that may fix your problem.

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1981 -300D w123 - Daily driver


"Even a clock that does not work is right twice a day"Polish proverb.