Another data point. After the OP mentioned that the ambient lighting was another setting that didn't change correctly I updated my profile with non default lighting and selected cluster theme B while my wife's profile remained with the defaults. Now, when starting the car and switching to my profile, the radio switches to my last station as it always did but the cluster theme, lighting and seat continue to reflect my wife's settings. However, if I switch back to her profile the radio will switch, but then switch to my profile will cause all the setting to be updated to mine!
So, now I have something that's definitive and demonstratable to the dealer. What I haven't figured out is how long it is after turning the engine off before the problem arises.