I'm way beyond you. Did you see the part where I said my mic was restricted? If you take a few minutes and research you can see this is a recurring problem that many people have raised in different arenas. That is, the mic being on when it shouldn't be. And usually reported the same: pick the phone up off a table and the home screen lights (raise to wake) with the orange bubble lit for just a fraction of a second. Like "Oops, tried to turn the mic off quickly before the user Ould see but got busted." This usually happens when the tv is on.
Something is going on and has been for a while.
After hearing people for a few years describe what I thought were conspiracy theories involving apparent hidden phone monitoring, a year or more ago I had a personal face-to-face conversation with a friend, and immediately began seeing related ads. I queried my friend very carefully and he had not disclosed our (innocuous) conversation in any way. He'd completely forgotten it the moment it was over.
I had said nothing to anyone and had not typed anything anything regarding the conversation into my phone or laptop. That's when I realized that something is definitely up. The stories I had been hearing are true.
Unauthorized monitoring via the iPhone mic.
FWIW twice now I've deleted the Roku remote app from my phone and this behavior has seemed to have stopped, coincidentally or not. I find it difficult to believe Roku would do this. They have a great reputation.
This needs:
a) to be escalated within Apple engineering, and
b) a method provided for users to see what has actually accessed he mic.