I'm having exactly the same problem. If you have any other suggestions that would be great.. Tried the alcohol swab, have rebooted it several times, pulled the battery out etc. I also cleared some of the media data / caches; but some of them I'm kinda afraid to.. Like if I clear data on the People app, it's not going to wipe out my contacts, right? haha. Are there any specific apps you have in mind?
One good thing, the regular microphone still works, so with headphones it can still be used to make calls. That's going to get annoying real fast though..
It was working this morning but got a bit of rain on it. Maybe that caused the problem?
Thanks a bunch!