iTunes waiting for items to copy during sync never finishes

I never had this problem, but just noticed it happening.. Please note it's a BUG. I went out and bought a 128GB iPhone just to hold all my songs. It wouldn't work. This never happened with the iPhone 3/3s/4/5/5s but started happening with the iPhone 6. After 40 hours of working through all possible solutions on the web and with Apple cares support (supposedly senior level) They finally suggested what the problem was. I had "Convert higher bit songs to 128 aac" Checked. This does not work One more thing when I unchecked that, the sync took like 3.5 hours instead of the 9-12 hours is usually took even on the smaller iphones. I have 98.7GB of music. Before I was just syncing a list of specific songs.

The syncing seems to be random when it has the problem though.