So ever since I got my iPhone my volume level with headphones on has never gone much farther than halfway. A couple days ago my left earbud started rattling and it's really bothering me. I think it started after I took a phone call the other day. I don't think it's blown because the volume hasn't been loud enough - and wouldn't it have blown the other earbud too? I haven't dropped them, stepped on them, or damaged them in any way. Will they replace these at the apple store?