This actually just started happening to me as well... I thought something was wrong with the Mophie, so I sent it back. Continuing to do so with the new one... Every 30 minutes my phone will start vibrating (Making the noise it makes once you plug in the phone). And it continues to do that until I unplug it. I'm so frustrated with Mophie right now... I'm on my fifth replacement, and there's still an issue with this case.