Has anyone else had issues with the EarPods' volume control sometimes not working on their iPhone 5? When this happens to me (which is frequently), the play/pause button still works, but volume up/down does not. I have to remove and reinsert the headphones several times to get it to work again, and then it seems to keep working until I unplug them again. Has this happened to anyone else? I don't know if it's my EarPods that are the problem, or the iPhone 5. I hope it's the not the phone.