From time to time, my droid4 will jus randomly throw out a buzz, or two. No alert is displayed, just buzz, or buzz-buzz, and nothing. Its not a huge issue or anything, just sort of annoying. It'll go days without doing it, and then it'll do it, sometimes a few times in an hour, then nothing for days sometimes. Anyone else get this? Not sure if its an app I run, or something internal to the stock moto firmware. It seems that it could be related to juice defender, but I haven't been able to prove that without a doubt.