I noticed that when using reachability my home button on my 6 Plus sounds hollow. I at first thought it was loose (maybe it is) so tried to move it around, but it doesn't, but when tapping with reacabiltiy it sounds really hollow? Kind of cheap sounding and feeling. Just wondering if this is normal? I compared to iPhones in the store by couldn't really hear. Some of those did move from side to side though.