I think you answered your own question.

It's not the DLA it's the door switch.

The DLA goes though the door switch. The door switch has a design defect that it collects water when the window is open and corrodes the motherboard. I've done the repair a few times.

90% confidence swapping the door switch mechanism will resolve your problem.

__________________
2011 E70 • N55 (me)
2012 E70 • N63 (wife)