My Alexa performs really poorly. I converted my house into a smart home (with devices I made, as I don't trust the average vendor), and she's handy for turning

My Alexa performs really poorly. I converted my house into a smart home (with devices I made, as I don't trust the average vendor), and she's handy for turning devices on and off, but she even gets that wrong sometimes. My wife will be asleep and I'll say "Alexa, lights off" and she'll hear "lights on" and the house goes full brightness. Don't get me started on playing music, she's useless for that. Yesterday I asked her to play a song fifteen times before I got angry and gave up at her inability to understand what I'm saying.