ok so i just bought a 64gb iphone 4s. i have like 70gbs of music so i filled the thing right up, but the problem is my iphone keeps auto syncing genius mixes each time i plug my phone to my mac. this takes up the very little space i do have left on the iphone. i have "select your own playlists" selected for syncing music and the genius mixes are not checked, yet when i plug my phone in it says syncing genius mixes. any help?