My iPhone is/was buzzing, crackling, doing the same thing, now however it has gotten worse, slowly got worse and worse and degraded, then yesterday finally it stopped working all together, the bottom speaker is great no problem there, the top speaker , can't hear anyone on calls, no music ( i'm currently in Brazil so no apple store here, so I have to wait until i'm back in the UK) so I decided to turn my phone off, big mistake, my phone then got stuck on the apple logo screen, even after a hard reset, so after putting it in recovery mode, I got it back up and running, I contacted apple via chat, they basically did the same thing I did already, and told me to try not let my battery die or turn off the phone, so that was great help! what type of advice is that! Also, when I told them about the speaker issue they said that they hadn't heard about it, and if it was more then my phone there would be "chatter" about it online, so I directed the representative to this thread on their own forum, and various google links, to which he said he knew nothing about it,..... so I decided to try beta 11.2.5, that didn't help, so I downgraded back to 11.2.1 and then wiped my phone set up as new and restored it, somehow on the 5th time, it helped, my phone turned back on without getting stuck on the apple logo, then suddenly the top speaker worked again for one call, then VERY quiet, I can hear the person on the other end if theres no other noise, but no good in public or anything like that, and as for music, well lets just say its good I have the bottom speaker still... I can make calls using speaker phone and the top speaker is so non existent that I don't notice the crackle,I do think its software related, but of course I won't know until the next update, or when i'm back home in the UK and can at least try to get it replaced so I can make calls, I just thought id share whats happening with my iPhone,