This is my second Moto X. The first one had a very loose power button and "crunchy" vibration. This second device seemed perfect to me until today when I noticed a glaring issue. The speaker will *always* drop from being very loud to being quiet after a second or two of playback. This happens with everything I've tried: Youtube, Gmusic, games, etc. This can't possibly be a hardware issue because if I stop the playback and restart it, it returns to normal for a few seconds, then reverts back. I've tried restarting, to no avail. Any ideas, guys?