Phone vibrating every few seconds

Samsung galaxy S3

Every so often my phone starts doing this wierd thing where when I turn it off it vibrates every few seconds, even if I fully power it down. The bizarre part is that I have tried taking the battery out and putting it back in, but it just continues to vibrate every few seconds. It's become very annoying, to the point where I have to take the battery out and leave it out. Does anyone know how to fix this?

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