[Q] Weak notification & ring vibrate

---

I recently noticed that I was always missing calls and not seeing notifications while my phone is on vibrate. I got someone to call me while my phone was on vibrate and noticed that the vibrate is REALLY REALLY weak. It was not this way when I first purchased the phone. Does anyone have any idea how to fix this?

What I've tried: Turning haptic feedback on and changing the vibrate intensity level to full in preferences > sound & display. It vibrates just fine for the haptic feedback but still has a very weak vibrate for ringing and notifications.

The only modifications I've made to the phone are: Root, circle battery icon mod and uninstalled AT&T bloatware.