If you go to an Apple store, they have a software program that tells them the average usage times, and longest usage without a charge. That should verify your problem. I had my 2 week old 3G unit replaced last week for the same issue with a "new" one at the store - even though I had bought it at AT&T. If it's a 3G, They know it's still under warranty- it hasn't even been out a month!