every time i sync, i tunes re adds all my music
for the past 2 years, i've had the problem of itunes sycing all my music each time i do a sync.
it used to only sync any changes that had been made, and be done quickly. now, even if no changes are made to any playlists, it resyncs all songs when i click sync. it does this with the cable and over wifi.
the only time it gives the expected behavior is if i sync with a cable and leave it plugged in. while plugged in, i can add a few songs, sync, and it will only add those few songs. once the cable is unplugged, itunes seems to think the phone has no music on it again. i've been through many phone support agents over the years, whom have had me erase the phone, create a new itunes library, check and uncheck all the sync options in various combinations, reinstall the os to get fresh itunes, and probably several other things i don't remember at the moment. anyone every found a solution to this? high sierra 10.13.4, ios 11.3.1
MacBook Pro with Retina display, macOS Sierra (10.12.1)
