If it's possible I would visit an Apple Store, they might be able to replace it right away.
All of the sudden my iPhone 4 home button stopped working. I tried hard rebooting it and that didn't fix it. It will sometimes work for a minute but for the most part it doesn't work. It didn't come in contact with any water/dirt, it just stopped working. I have Apple Care but need my phone for work so I can't have it gone for a few days. Any help would be much appreciated! Thanks!
Make an appointment with an Apple Genius at the Apple Store in Fresno. They will know if it got wet or not, and if it didn't, they'll replace it or fix it.