My Alexa recently lost knowledge of most rooms, it can't work most lights anymore. A few months prior it suddenly refused to work with "livingroom", apparently some new device of that name appeared after a automatic device scan, but would not react or be removable. In the end I renamed it "main room" which worked until the recent snafu. The only, only good thing about Alexa is the low latency. But if most things just don't work right, what good is it.