I too bought the iPad Air2 128g on their website, the first one I received had a lot of vibration on the speaker, more then normal as it was going through my wrist when touching the screen. Apple online sent me a replacement and that sorted out the vibration issues, now the vibration was acceptable for a product so thin. But the replacement iPad starting making the 'pop' sound and when I got in touch with them, they arranged collection and sent me a replacement (my 3 one). The replacement is brand new and its making the same sound. Once again they have offered a replacement or refund option.
i have now got a hot line to the courier and the returns are piling up. Sadly i really need an iPad as my old one was ancient and not working well anymore. I am now getting fed up as i am waiting on my 4 or is it 5th replacement, i cant remember.
So the only option left (as a needed one as my old one was ancient and not working.........
I'm now waiting on another replacement, but this time I've asked for a 64GB instead of the 128GB i originally ordered. I'm hoping that the problem is only happening in the 128GB. If not then I'll probably have to go back to the older model which is a shame as I really loved the speed, thinness and lightness of this new one. Not that I have had much chance to use them as I don't seem to get beyond setting them up.
I think its a hardware problem as i have set each of these iPads up as new and not used the restore from backup option to set it up. My mums iPad (an iPad 3) and my nephews iPad (iPad Air) has the latest IOS version and there is no pop sound on theirs
Apple see to be a bit slow on dealing with this issue as there seems to be a lot of comments on this issue.
I'm off to their feedback section next to let them know if this issue.