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Help Phone vibrates once, then quickly 3 times

It's been 1 month since I got my droid 3. Just recently, my phone has started to vibrate once then quickly vibrate 3 times. This is will happen once or twice a day, every other day or so.

My phone is not rooted and I only download apps from the android market. There is no email, text, call or any other new notification. Any ideas how to fix this?
 
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