IPod boots into diagnostic mode

Hello,
I have a 5th gen iPod, 60 GB. Recently, when I wake my iPod from sleep, it boots right into the diagnostic mode. I keep resetting it, and it keeps booting into diagnostic mode. I've run the auto test and a bunch of the manual tests, and nothing looks like it failed, but I really can't tell.
Eventually, after resetting it enough times, it will boot correctly and will be useable. But then the next day, it will start booting into diag mode again.
I have tried plugging it into my iMac and that does nothing. It's not recognized when it's in diagnostic mode. I've also tried plugging it into the wall, and that didn't help. The battery is relatively full (when I get to the regular menus, the battery meter looks 90% full or more).
So is this one going the way of the dodo? Or is there something I can do? I would like this one to last until mid-year, because I think I will be getting an iPhone then. I plan to do a restore next time it boots into the regular screen.
Thanks!

Well, I was able to get it to boot again. For some reason, whenever I plug it into the power adaptor in my car, it comes back to life.
:shrug:
Restoring it did not help, cause it's still happening.
Also, it seems that this booting-into-diagnostic-mode problem is caused when the iPod goes to sleep (i.e., when you wake it up and the first thing you see is the Apple logo). If I turn it off and turn it back on again relatively soon, it goes right into the main menu. But if I don't touch it for 24 hours or so and then I turn it on, I see the Apple logo, hear a beep and a click, and it boots into diagnostic mode.
Anybody have any ideas? It's out of warranty so worst case scenario is I keep resurrecting it using my car until I get my iPhone.

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