An other iPod problem.

[Mag-Mower]

After finding out how to fix the thing, it ran well for about 2 weeks. Now, I get this weird problem. I have the 30gb iPod video, and this evening, I left it to charge, when I came back to check its status, iTunes kept wanting to update the iPod with more songs, I said no a few times. After this, my iPod turns off. I cannot turn it on, untill i disconnect it from the computer. at this point, the thing powers up normally, only half charged. Now, I got to plug it in again, and it looks like it wants to sync, but after a second or so, the iPod just turns off. I tried reseting my system, and the iPod, but nothing has worked. Any Ideas?