My iPhone XS did the same thing....... spooky....
Stay alert folks, I do t think this is over by a long shot..
What I found funny, was that every time I turned on my phone, it was telling me that I needed to have it plugged in to accept some “critical update” for the last month or so.
It can’t update without being plugged, for some reason.
So my phone has lived in the kitchen, in my purse, unplugged.
It stopped whining about the update so I reckon it gave up.
*No* idea how the auto update resurrected itself, unbidden.
It’s off again.
I find myself approaching my phone as if it’s a deadly ambush predator now, poking it with a stick, as it were, before I do anything with it.
The joys of cyber-slavery.
I miss my old Motorola Star-Tak.
It was indestructible and stupid.