Help Needed Weird Science at play

[Strikefalcon]

Problem: intermittent dead batteries overnight. Shutting off key will kill engine but not the rest of the electrical circuits. Like it’s on accessories.

A while back the horn would randomly blow then progressively got worse. I pulled the fuse to stop that.

The radio and or CD will randomly turn on.

Anyone have any clue beside Demon possession on what’s causing this

THANKS IN ADVANCE