Restarting iTouch

[hafamaca]

So about half the time I connect my iTouch to any computer it'll restart. Once the iTouch restarts, the battery icon shows 1/2-1/3 of the battery life is is drained. When syncing the iTouch after the sudden restart, it takes forever.

I've restored my iTouch a few times, doesn't solve the restarting issue. It only does it when I connect it to a computer (not power plug). I've tried different cords, doesn't seem to be the problem. I've connected two other iTouch (g1, as is mine) many many times, none have restarted. My other iTouch (which was stolen), never had a problem.

Any ideas why this is happening?
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Mac Mini 1.83 GHz C2D
iBook G4 1.42 GHz 14"
iPod Shuffle 1 GB (g2) | iPod Touch 16 GB (g1)