I'm trying to get the "OK Google" command to work properly and I'm not sure if it just isn't working or I'm missing something. When I say "OK Google", it brings up the Google Search screen and microphone turns red however it doesn't appear to be hearing anything I say. The mic soon turns grey and it tells me to tap it. The mic will turn red again but still it doesn't hear me. On the other hand, if I manually go into the Google Search screen by tapping on the white mic in the search box, it then makes a "ding" and works exactly as it should (hears me just fine). What's the deal here?