My iPhone 4 won't sync with iTunes.

My iPhone 4 won't sync with iTunes

I am running iTunes 11.1.5.5, and my phone is using iOS 7.1

Windows 8 recognizes that the phone is connected, and even asks if I would like to download pictures, however iTunes will not.

So far, I have stopped and restarted AMDS, iTunes, my laptop, and the iphone. None of these have had any success. I've tried using a different cable, but the results were the same. The phone can download songs via its own iTunes app, but cannot sync with iTunes on the laptop.

How can I get my phone to start syncing with iTunes again? This problem occurs sparatically, sometimes syncing and sometimes ignoring the phone altogether, like it is now.