Strange vibrating buzzing sound?

[quamsi]

Today I had my first worrisome issue with my 2 week old X. I was browsing the web while chatting on iMessage. Suddenly when switching between the apps, my phone made a quiet yet audible buzzing (?) sound and literally felt like its internal were groaning. The vibrating (that’s not the right term but idk how to describe) did not feel like the vibrations from the tactic engine, and the sound was not from the speakers, it was from elsewhere inside the phone. It felt like an error. I could feel it and hear it. It was as if the phone got stuck in a freak-out-state, for a few seconds, and stopped just as suddenly. Anyone know what’s up?

 

[akash.nu]

Could be a glitch with the Taptic Engine. If it happens again then better take it to the Apple store.