@Kennyraisin
It certainly sounds that way.
You are likely using the IR to control the TV, not CEC. And, it may be that the IR signal for that TV interferes with the smoke detector.
Have you pulled out the original TV remote and tried it? Does it set off the alarm too? If so, that would confirm it.
DBDukes
Roku Community Streaming Expert
Note: I am not a Roku employee.
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