Problems Syncing iPhone during "backing up" process

I'm not sure if anyone has ever posted this problem so forgive me if it has been posted. Just recently, everytime I sync my iphone, during the backup process my phone will freeze and the backup will stop. During the freeze the spinning wheel will appear while the "sync is in progress" is frozen on the screen and I have to unplug the phone and restart it. Is there a fix to this problem? It synced fine for a while and just recently started doing this a week to a week and a half ago.