[Q] LG G2 D802 build quality? topic

Hello,

I received a LG G2 D802 and have a question regarding it('s build quality). I have no other D802 to compare it to, that's why I am asking here:

When tapping firmly with the finger on the upper right side of the device, I can hear some kind of "clattering" from inside the device. Now I am wondering:

Is this normal?

I had a look at some tear down pictures/videos of the LG G2 and it seems like the motor for the vibration feature is located in the upper right side of the device.

So, could it be the motor which produces this clattering sound when firmly tapping on the right side of the device with the finger?

It might be worth mentioning that, when shaking the device, I can not hear this clattering sound as much. It's much quieter when shaking the device.

It's basically only happening to this extend when firmly tapping the upper right side of the device with the finger.

Or could the clattering simply come from the optical image stabilization of the camera when shaking/tapping the device?

Also:

When firmly tapping the touchscreen, I can feel and hear a difference between tapping the right side of the touchscreen and tapping the left side of the touchscreen.

When firmly tapping the left side of the touchscreen, it feels very "stiff" / "hard". But I mean that in a good way, it feels very solid.

However, when firmly tapping the right side of the touchscreen it feels kinda like as if the area below the touchscreen would somehow be a little "hollow". I can also hear a difference when firmly tapping the touchscreen while holding it to my ear. When tapping the left side it sounds solid. But when tapping the right side it sounds a little "hollow", kinda like a audible resonance.

The glass and display does not seem to be visibly moving though and the device seems to be working just fine otherwise.

Is this normal?

PS: Tapping the rear side of the device is similar and also produces this somehow "hollow" audible resonance.

Regards