Here's the deal- the other day I turned my DS Lite on and the startup chime sound played in an unusual high pitch. This happened with and without headphones, with or without a game on. It happened several times and I could find no obvious hardware reason for this. All other sound effects played as they should so it was not a speaker or sound processing issue. Now though, it's suddenly gone back to playing the proper chime. Anyone have a clue as to what may have been going on?