TL;DR: Smart speakers are designed to listen only for their wake word locally, but you can check your device's activity history in its companion app to see whether recordings have been logged more often than expected, including accidental triggers. Review your voice-assistant history and delete recordings in the companion app (Amazon Alexa app > Settings > Alexa Privacy, or Google Home app > Settings > Assistant), mute the microphone with the device's physical mute button when not needed, and disable "help improve" voice-recording sharing in the privacy settings.
Smart speakers are designed to listen only for their wake word locally, but you can check your device's activity history in its companion app to see whether recordings have been logged more often than expected, including accidental triggers.
What Usually Causes This
These devices process audio locally to detect the wake word and only begin recording and sending audio to the cloud after it's detected — accidental activations happen when background speech sounds similar to the wake word.
What to Do About It
Review your voice-assistant history and delete recordings in the companion app (Amazon Alexa app > Settings > Alexa Privacy, or Google Home app > Settings > Assistant), mute the microphone with the device's physical mute button when not needed, and disable "help improve" voice-recording sharing in the privacy settings.
If this looks similar to something else you've seen, it's worth reading Is My Smart TV Spying on Me?.
This pattern shows up elsewhere too — see Is My Webcam Hacked? How to Check.
Frequently Asked Questions
What are the real warning signs?
Smart speakers are designed to listen only for their wake word locally, but you can check your device's activity history in its companion app to see whether recordings have been logged more often than expected, including accidental triggers.
What usually causes this?
These devices process audio locally to detect the wake word and only begin recording and sending audio to the cloud after it's detected — accidental activations happen when background speech sounds similar to the wake word.
What should I do about it?
Review your voice-assistant history and delete recordings in the companion app (Amazon Alexa app > Settings > Alexa Privacy, or Google Home app > Settings > Assistant), mute the microphone with the device's physical mute button when not needed, and disable "help improve" voice-recording sharing in the privacy settings.
Should I be worried if I only see one sign?
One sign alone (like a slower device) is usually not cause for alarm — most single symptoms have mundane explanations. Multiple signs together, especially unexpected data usage or unfamiliar apps, are worth investigating.