Yesterday I installed a New Roku Express on my older Phillips TV that also has an Xfinity Box also on it.
Whenever I try to watch the Xfinity box whenever I try to change the channel the TV switched inputs to the Roku. I'm mystified about what is going on.
Try the following:
settings> system> control other devices(cec)> uncheck 1-touch play
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That didi it. I wasn't aware such an setting existed.
Technically its @Tivoburkee 's solution.
you should change that around.