Since upgrading to IOS 7 on my iPhone 4S, it is very difficult to sync music. I have a 64 GB phone, and have over 7,000 songs in my iTunes library. Therefore, I sync my entire library. However, when syncing, it seems to hang on one step saying "Waiting for Changes to be applied". I've tried restoring my iPhone and still seem to be having this problem. Is this unique to me, or can someone help? Thanks.