I have had my echo 2nd generation for about 3 weeks. It worked fine for the first week. Now it won't respond to voice commands unless I press the "action button" on top several times a day. My son has the Echo Plus and he only tells Alexa to wake up and thats it. I'm ready to send it back. Help please. Anything you can suggest to help me troubleshoot this problem will be appreciated. Thanks! Anne