Default Camera Vibration

so about 2 months ago my note 3 started vibrating when using the camera. I first noticed it in snapchat, the camera wouldn't focus and I noticed the phone is vibrating. Basically every time an app uses the camera and it fails to focus the phone would start vibrating for a really long period of time, which then makes pics distort and the camera fails to focus again which extends the vibration. I thought it's a touchwiz rom error (I was using xnote when it happened for first time (4.4 btw, don't remember which version of x-note it was) but then I tried out some AOSP roms and the stock s5 port and then I came back to xnote v16 and it kept doing this vibration thing. Any ideas what causes it/how to fix it?