This has happened multiple times - my wife and I will be watching TV in bed, finish the show/movie, return to the Roku home screen, turn off the TV and start going to sleep.
Then, all of a sudden, flash and sound, and a #&&#@$# ad starts playing. We return to home screen, turn the TV back off, head back to sleep when BAM it happens again.
The ads have so far all been for Roku Channel stuff or the then current heavily sponsored ads on Roku.
It seems to be correlated to when I had earlier used my phone for remote listening from that Roku, but I've always been exited from the app.
As an experiment the most recent time I turned off the TV twice, ads brought it back both times, then I force-quit the Roku app on my phone and it didn't recur.
So I have one instance where force quitting the app on my phone made it stop.
I'm curious if anyone else is experiencing this incredibly frustrating and disturbing behavior and/or if there's a way to prevent it.