For the past few months, the left shoulder button on my black DS Lite comes and goes. When it isn't working, I can't do anything to make it work again. The DS just doesn't respond when I click it. I've tried it with my G6 Lite and with retail games. Then, magically, it will return, like there was never any problem. It will work for a week or two, then stop working again. I've even opened up the case and poked at the left shoulder button while the machine was running, and it still didn't work. Has anyone else experienced this kind of silliness?