IPhone 4 will not charge - it connects, but then disconnects

iPhone 4 8gb/White. Purchased November 2011, AT&T.
Just started happening Saturday (2 days ago).
Plug in the 30-pin connector, and USB to PC: it will chirp, but then stop. This same PC/USB connector supports 2 other iPods (4th gen) and a iPhone 4S (granted, not all are plugged in together, but one at a time!), and the White iPhone 4 is the only one with the issue.
Tried on another PC, USB plugged directly in, no hubs, no extensions, again, a cable that is tried and true and works on other iOS devices. SAME problem. Chirp-on, then disconnect after 1 second. Does this repeatedly 3 or 4 times in a row, then gives up for a while.
Tried with straight USB AC power cube - same result. Tried a different USB AC power cube - same result.
I have tried to power the phone off and charge it with the power off, but when the port wakes back up, it turns the phone back on.
I managed to keep enough charge in the phone to update it from 5.0.1 to 5.1.1. Also did a "reset all settings" - and the problem persists.
I have NOT yet done an erase all settings (is it necessary?) or restore, but mostly because the port won't stay connected long enough to do so.
This phone has NO liquid sensors tripped, does not have a lot of use on it, only has 17 total hours usage on cellular usage.
I have an appointment at the Apple store tomorrow. Is there something I should try in the meantime?
Recap:
I have ruled out the cable, the PC, power cube, as all other iOS devices work fine with the combination of cables/chargers/etc.

Clean the dock connector using a soft, dry brush.

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