LG G2 Keeps vibrating for no reason

[Sushiiii]

My phone vibrates like every 5 minutes and idk why. When it vibrates, there isnt a notification at the top so I dont know which app is making the sounds (if it's even caused by an app). I tried messing around with the settings and googling the answer, but couldnt find one. Anyone else have this problem?

 

[B. Diddy]

Does it persist after a reboot? If so, try booting into Safe Mode, which prevents all 3rd party apps from starting up. If the vibration goes away, then start opening apps one by one, and see if they come back. Restart the Device in Safe Mode LG G2 | Verizon Wireless

 

[Sushiiii]

After going into safe mode, it doesnt vibrate anymore, so it's from an app. But, how do you open apps one by one? Thanks

 

[B. Diddy]

I was under the impression that you could go to the App Drawer and start opening apps--Safe Mode just prevents them from starting up initially. To be honest, I've never tried it myself (although I should, so that at least I know how it works).