ITunes "waiting for changes to apply"?

When I try to sync my iphone to my itunes on my Mac, I get " Waiting for changes to apply. If I wait long enough (like and hour) sometimes it will start to sync, but it has taken all 2000 songs off my phone and is now reloading them. (l have just left my phone overnight to get it to do this) Now this last time... show more When I try to sync my iphone to my itunes on my Mac, I get " Waiting for changes to apply. If I wait long enough (like and hour) sometimes it will start to sync, but it has taken all 2000 songs off my phone and is now reloading them. (l have just left my phone overnight to get it to do this) Now this last time I get up in the morning and sync canceled half way though. I have more than enough room on my phone for this, so it's not a space issue. Went to apple sight and here so far and not finding allot of answers, just a lot of people with the same issue. Hoping someone has found the fix.
Thanks
Update: PS I have updated both the phone and the mac
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