As of today, when I connect iPhone to Mac to sync something weird happens. The phone seems to think it needs to copy all 10,000 tracks. It does so, takes 90 mins. Finishes with no error messages. And when I disconnect from the Mac, iPhone says it has no songs/music stored on the phone.
I have made any changes in recent days. What is going on?
I'm on an iPhone 7 with iOS 10.3.2. Also latest iTunes - 12.6.1. There is 91GB of space left on the 127GB phone.