I've only had my G06 since 3/28, but I entered my CD password at the dealership that day and haven't had to enter it (or had any problems) since. I'm running 11/2019.55.
I remembered one thread that had some similarity...note
TurtleBoy 's post:
https://g05.bimmerpost.com/forums/sh...assword+idrive.
Hope that helps...nothing more annoying than when the technology aspects aren't working as expected or worse yet, inconsistently.