It seems to do it very randomly. It'll vibrate once like you're receiving a text, only there's no text, no message, nothing. The screen doesn't even "wake up", it just stays black. It happens about once every 10 minutes, sometimes sooner, sometimes later. One thing's for sure, it's very annoying. Has anyone experienced this and know a fix?
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The first thing that I would try to do is determine whether this is a hardware issue or a software issue. Back up your Centro by performing a hotsynch and perform a hard reset. After doing the hard reset, don't install any programs or change any settings on your Centro and see if it still vibrates randomly after a few days. If so, you have a hardware issue and should return it.
If the unit no longer randomly vibrates after the hard reset (for a few days), it is a program or a setting that is causing this. Install your third party applications one at a time waiting a day or so between each install to narrow down the offending application.
Don't perform a re-hotsynch after your Centro no longer randomly vibrates because this will transfer all the old programs/settings back onto your Centro and chances are, your Centro will start randomly vibrating again.
Found a fix on another forum. It's the Sprint Mobile Mail app. By default, its configured to vibrate whenever you get new email. You have to go into the preferences and uncheck "vibrate" under "alerts." No vibrating ever since.