So I recently had my launch iPhone 6 replaced by AppleCare due to a shifting front FaceTime camera. But now I feel like I have a different, annoying issue. The other day I am on a call and I notice the (what's best described as) clicking noises that used to be common with older cellphones around large speakers. Feedback? Whatever you want to call it. I remember it was awful and very common with Nextel phones, but in my case not the high pitched stuff. Just the fast clicking (like 3 or 4 clicks per second, constantly). Anyway, this is only happening with the internal earpiece speaker, not the speakerphone. It's annoying, but I think it will be one of those tough items to get Apple to acknowledge (even if it's due to Apple stores being a noisy environment). I don't recall this happening on any of my previous iPhones, so I was hoping to get a sanity check on here before I go in yet again to an Apple Store. Anyone else experience this? Or not? Thanks!