Sync completes with all data transferred, but never completes - just hangs

When I connect my iPhone by USB, iTunes fires up and my Sync seems to kick off without a hitch. Sync in Progress appears on the screen for as many as 4 hours. If I disconnect after 15-20 minutes of syncing, new programs, appointments, and contacts all appear on the iPhone... but it just won't finish the Sync on its own without me canceling it with a swipe of the iPhone screen.
Any ideas?

I haven't had that happen but from other posts I have read, when there is a hang up of any sort with an Apple product, you usually should reset. Don't know if you have done. There are various ways to reset. I would first try holding down both buttons and wait for it to allow you to power down the Iphone.

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