This issue has surfaced recently for me as well; I believe it came about (for me) when I had my softaware updated to Phase 4-point-something.I have a similar problem but it has to do with holding the color setting. 80% of the time the ambient lighting reverts back to white regardless of the color that I actually chose. Car is currently at the dealer to address that among other things.
I would find that unacceptable. I’m sure you have more software glitches you can tell them, like ACP not working after a remote start, or a choppy reverse camera or a some features not available like Live or mobile data, the list goes on. Tell them you want the whole update or you’ll take it to another dealer.I dropped my truck off this am. I asked for them to apply the 18D update in part to address the ambient lighting issue. They were reluctant to apply the "whole 18D" update. They said they've had 50%/50% success with Bluetooth and rather they wanted to know if there were specific issues I wanted addressed. They said they can apply the ambient lighting fix separately from the the entire update. I should get the truck back today and will report back.