I have a 1st gen Ipod touch, had it for about 2 and a half years. Only recently, the earphone jack has started failing. Not completely, but when you plug in any earbuds/phones, you basically hear the music like an instrumental, without the voice track (or very muted). The only way to get it to work properly is to move the jack around for a few minutes to find a place it works. Is this a common problem? Can it be fixed?