I've started noticing more false positives since iOS 12 launched, and there's a couple requests that now don't give me the expected response. The most annoying issue happens to be requesting Siri to set an alarm. I'll ask: "Hey Siri, turn on my 6:15am alarm." to which she'll respond, "Which alarm do you want to turn on..." and then list all the different alarms I've set on the HomePod.
This all changed with iOS 12, and I wonder if I should reach out to Apple or just live with it and hope it improves with a software update??