Mac itunes ratings change during sync
It's been a while since I worked with my music smart playlists and I now find that the playlists were grossly in error. I spent hours updating all my ratings only to find that after I synced to my iPod the songs in the smart playlists based on ratings still weren't right. When I went back to iTunes I found that most of the ratings had been changed. And they were NOT changed to the album ratings. After several iterations and staying up until the wee hours of the morning, I finally concluded that the change occurred during the sync. The changes were consistent -- the same songs were changed to the same new ratings multiple times. Some songs with 1 star were changed to 5 even if the album rating was non existent or 3. Others were changed from 5 to 1.
This sounds like a bug and makes the smart playlists totally unusable. Is there a work or fix out there? Some box I need to uncheck in iTunes? I've looked through the preferences and don't see anything.
MacBook Air (11-inch Mid 2013), OS X Yosemite (10.10.4)