I see this happening quite often. I’ll have been watching Netflix via Roku, then turned off my Samsung TV. Next day, I turn on TV and watch cable for a while. If I then switch to Roku, it is in the middle of playing a movie from my Plex server. Typically, it will be whatever last movie I added to my Plex library.
I’ve disabled CEC on the Samsung TV. I don’t see that Roku has an option to “auto-play” and I don’t see Plex having a setting for “auto-play” either.
Any idea how I can turn this off? Thanks.