IPhone 5 randomly vibrates in pulses

I only notice this when I am in bed but every 3 sec- 6min my iphone will vibrate in a quick succession of 1-4 buzzes it will then stop and then 3 sec- 6 min later it will do it again.

I think I figured it out, my power cable has 3 others cords plugged in and sometimes when it buzzes the battery icon changes from charging to blank and it only happens when it's charging. So I think it's because I don't have enought volts to run all 3 cables and it switches on and off.

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