wonder if anyone can help, i have a refurb iPhone 5 from the Apple store as my new one had a few pixels missing... anyways... after 3 weeks there seems to be an intermittant fault with the speaker, at times the people i call can not hear me at all but i can fully hear them and other times there is no issue at all. i have re-set my phone twice and there is no change, i have not dropped my phone or had any water on it. i want to take it to the Apple store but i know my phone will just work fine when they test it! what do i do?