A few days ago GH "woke up" 8 times in 5 hours without me saying one word. The tv was on about 15 ft away. When I listened to the audio clips under "My Activity", all you could hear was the tv. It wasn't loud enough to be able to understand what was being said but I remember each time GH woke up, replaying in my mind what I just heard and nothing sounded like "Hey Google". She's picking up some bad habits from Alexa
OTOH, Alexa has been better the last few days about waking up without being spoken to.