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Take this for what it's worth, I was a GM wrench in 1994' so this is dated information... However when we had massive multi-system failures like that It was almost always a shared electrical path at fault.
What you're describing is almost exactly what we had with the Cadillac Atlante's when the rear computer would get wet. The top to rear parcel shelf seal would shift and water would get into the electrical. The digital dash would die, power windows and top would be stuck down...or up, door locks would be stuck locked. It was new computer time after that.
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2021 Model Y
2005 Cayenne Turbo
2012 Panamera 4S
1980 911 SC
1999 996 Cab
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