iPod Minor But Nagging Backlight Issue

[kokoricoboy]

I use the Apple Speaker/Dock at night. I have some quiet playlists about 45 minutes in length that I like to go to sleep to. Sometimes, and it appears random, the backlight will not go off which can get annoying while trying to fall asleep. I take the iPod to the gym sometimes and run it off the battery, but thats about it for varied uses. All other times it is in the dock in my bedroom. Sometimes the setting works exactly as advertised: If I have it set on 3, 5, 10 or whatever seconds it will go off in that time. Other times it just stays on and I get angry.

Small problem, I know. But I can't figure it out.

Thanks for any advice.