I am receiving my 6th Razr Maxx Monday from Fedex for the same audio problems. Two that wouldn't take the jack because of a metal obstruction and the latest one(got it 3 days ago) for no right channel audio output. The other two were other reasons. I wish they'd stop sending factory floor rejects and send me a new phone. So far only one free months voice service for my trouble.
Also, I'm not a fan of phone covers of any kind. Heat isn't good for electronics and they do a great job of holding it in.