I have the new 12.9 iPad Pro. When I run my thumb near the bezel (opposite side of the Home Button) I hear this faint popping sound and it feels almost like it's a bit hollow under the display or there's an air pocket. I noticed it one day when I was scrolling with my thumb. The side with the Home Button doesn't make this sound and feels solid when I run my finger over it. I took it to an Apple store and they compared mine to a store model which exhibited the same behavior. They told me if there was something wrong with the display I would notice it on screen. Other than this, the device works great. Super fast. No issues with apps, no backlight bleed, speakers are great. Anyone else have this issue?