I have a 4th generation iPod nano, 8GB. It's about 3.5 years old and it's finally seeing its first problem. When I try to toggle the lock, my iPod will lock.. for 5 seconds. Even though it's physically toggled to be locked, the screen will randomly turn on after I turn it off. When it's in my pocket, even though it's supposed to be locked, sometimes the volume will increase or the song will change. When I look at the screen, even though it's physically toggled to be locked, I see that the lock icon on the screen will appear and disappear. It's just annoying and it kills battery. Anything I can do? Thank you.