I have 3 Echo's and each one is now unplugged. If you go to the Alexa app and choose your device ---> settings and then history you'll find a long list of recordings the echo has made while secretly listening into your home. I had no idea this was happening and I find it very creepy. Nobody was using the wake word, etc. It just listened in and then recorded bits of conversation. I'm getting rid of them.
**UPDATE** I discussed this issue with Customer Service who, by the way, have the best Rep's in the world. Their engineers reviewed my data and concluded the sounds being recorded were coming from a TV in the room. At first it was hard to agree with them but after I listened over and over to a few of the recordings it was apparent it was from the TV. My Bad!! I'm back to being an Echo fan. 😊