Aloha Mike,
I sometimes get the same thing while attempting to use the dock I got with my Apple Bluetooth headset. I connect the dock to my iMac via a USB hub, so I decided to utilize a different port, and it worked for a while. Once the message started up again, I switched back to the original port, and everything's been peachy, at least thus far (now watch - I've just jinxed myself with that comment

). How does your iPhone dock connect to your Mac/PC? You can try to choose a different USB port and see if that works.
HawaiiMacAddict