vibrate

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I have an odd issue happening. Between 4pm and 10pm my t-mobile touch pro 2 randomly vibrates regardless if it is on silent mode or not. I check and do not see any alerts, emails or messages. It will vibrate once then stop .... to the best of my knowledge I have not set up anjy reminders. In fact, the device is only about a month old.

Any ideas where I might look to find the source of this vibrating?

Thanks -