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This is a really bizarre problem. I'm using a MacBook Pro running Mountain Lion and an iPhone 4S, both with the latest updates. I'm using the bundled Apple cord. When I plug it into the wall charger, it charges fine. But when I plug it into my MacBook to sync, it will frequently disconnect (sometimes as many as ten times in as many seconds). I jiggle the cord on both ends, plug it into the other USB port, and even cleaned out the inside of the phone. Also, when I use the USB ports for my external keyboard and mouse, everything works fine.

Does anyone have any suggestions?

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Do other devices work on the USB port your iPhone was on? I'd say get someone else's computer, cable, and iPhone and try different combinations of them to isolate the problem. – Kevin Chen Jan 16 at 7:17
Yeah, as noted above I'm typing on an external keyboard that uses the same USB ports. – Andrew Min Jan 16 at 14:09

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