Connect 4S to USB cable, camera goes black?

At work I have an iMac 24,  2.8 GHz Intel Core 2 Duo with an Apple iPad keyboard dock connected to the USB port.  I normally keep my iPad in this dock, but sometime I unplug the dock connector and  use it to charge my iPhone 4S.
Yesterday afternoon, after having the phone connected I disconnected it and then the camera dimmed and went black.  It was black in every camera app I have, and the default camera stayed at the "shutter" screen.  I tried shut down/restart and hard reboot to no avail. Everything else about the phone worked fine.
I was ready to bring it in to the Apple Store, but then last night while I had it connected to an iPhone AC adapter, I hard reset it again and the camera came back on. And worked fine all day... until I connected it to the USB cable and the iMac again this afternoon.  This again blacked the camera out in all apps.
I disconnected it and hard reset it, and the camera works.
What could be causing this?  Why only when connected to this computer (which I have done for months without incident)? Is the camera about to fail?

Call AppleCare or make an appointment at an Apple store if there is one nearby. The iPhone includes a one year warranty.

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