[Q] Focus goes into restart loop when I plug in USB

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Week-old samsung focus, 16GB Sandisk Class 2 (verified real sandisk). No problems prior to yesterday.

Phone goes into a restart loop when I plug in USB for charging, both directly to a wall charger as well as to the computer. About 20 seconds after I plug in the usb cable I get "goodbye", it restarts, and when the Windows Mobile screen flashes up instead of going to the lock screen it goes back to "goodbye" and restarts.

Any ideas before I blow out my lovingly-configured profile by removing the Sandisk?

Thanks!

Not really an idea or solution, but more info is usually better.

I experience something similar, On both the LG quantum i had, and my Samsung Focus. When i plug into the USB in my car it goes through a continuous cycle.
Seems as if it's charging, then car radio auto changes to aux,then phone makes sound as if you just plugged in, radio goes back to previous setting.then radio changes to aux again over and over.

Suspect it has to do with radio looking for a mass storage device, but when it doesn't find one why does it retry.

Follow-up

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Well, I got antsy, yanked my SD card, and did a hard reset. Still no joy - plugging it into both wall and computer, via various USB cables, sets it in a restart loop.