It just got horribly slow on mine as of "today" (I haven't driven it in a week, so, I am not sure when the update happened that caused it).Android Auto recently stopped working on my 2019 Limited.
I have the unstable notice too, it started about 6 weeks ago on my Ascent, after an last update to my phone, and then about two weeks ago the unstable notice started on my f pace.
It's a known problem. There is a supposed fix, but despite periodically manually updating my Google / Android software, it's still pukes on me every time I try to text through AA.
It's very annoying, although no fault of the cars themselves.