All electrical turns off when shutting the door sometimes

To me it seems like you probably just have a loose ground wire or battery terminal. Or maybe you just need to clean the terminals.

How to clean terminals - https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked

If that is not it, then follow those cables to wherever they go and make absolutely sure that the connection surfaces are very clean and tight. Dirt and/or looseness will cause all sorts of problems.

Let us know what you find.