Sync session failed to start

Lately I have been having problems syncing my iPhone with iTunes. The most recent error is "Sync Session Failed to Start". However, even before when I could sync, it wasn't fully syncing. For example, as I listen to music on my iPhone, I will give it a star rating, but that data won't transfer to iTunes. Additionally, the "plays" and "Skips" stats are not transferring either.

Can anyone help?