I don’t recall any description quite like this before, but a couple of ideas:
On your Roku, try going to settings> system> control other devices (CEC)> and uncheck 1-touch play.
(I can’t figure out exactly how the subscription comes into this, but possibly if a screen saver with ads was active and it was advertising that channel, that might explain it.)
If that doesn’t fix it, another possibility is that you have one of those unfortunate cases of IR code overlap, where both the Roku and the cable system may be reacting to a cable remote button. If that’s going on, you could hide/cover the IR sensor on the Roku since you have a Wi-Fi remote for that anyway.
I was experiencing what appeared to be the indentical problem. I found both suggestions fixed the issue. I opted for the "unchecking" option
Thank you
