Sometime a few weeks to a month ago I started to notice my left pod squeaking when I walked while listening to music. It's that high pitched squeak like feedback from a microphone. It was only my left pod and it didn't happen when noise cancellation was set to "off". I figured the only thing that made sense was physical damage to noise cancellation from dropping. It's covered by Applecare so I chatted with support about getting a replacement. They had me do the obligatory factory reset which I thought was a waste of time but something I had to do for them so I did it...and wouldn't you know, the squeaking is gone. Has anybody else experience this?