Merely shutting off the engine and locking it powers everything down. I use the comfort access feature to auto-lock the car as I walk away so this behavioral oddity we all see is moot now.
On the Idrive reboot, I've seen so many variations of how long you need to hold the button with some folks claiming it's a different reboot if you hold it longer... so I tried to test it. I couldn't discern any differences between holding the power button down for ~30 seconds which triggers a reboot and doing so for well over a minute—all it seemed to do was consider it another 30-second hold and rebooted again.
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