iTunes keeps deleting my playlists
iTunes keeps deleting a number of playlists from my computer, which leaves me having to roll back to an older back up of my library (not a problem, just an inconvenience). All of my music remains, only the playlists vanish. It doesn't delete them all, but it deletes the same ones every time. Also, I have many of my playlists organized into playlist folders, and it seems as those are what is getting deleted. It seems like 4 or 5 of my folders get deleted, deleting all of the playlists under them, while 4 folders remain, as do all playlists under those folders. All playlists not under a folder also remain. I have backups saved so I can get my playlists back, but it seems that as soon as I sync over wifi, everything gets deleted.
The problem first started when I got my iPhone 4S on the 14th. Im pretty sure its not an iOS 5 or iCloud problem specifically because I had iOS 5 running on my 3GS before my 4S got here, and everything was fine. But when I restored my iPhone 4S for the first time using an iCloud backup from my 3GS, everything came back except my songs. I synced those via USB, and thats when I first noticed my playlists were missing. I rolled back to an earlier library and synced via USB to get those playlists on my 4S. Ever since, it seems when syncing via wifi, even without changing any of my songs, it deletes the same playlists over and over again. Its done this about 4 times now, so I'm obviously not finding a successful solution, aside from syncing via USB. I'd like to fix this though. Does anyone know what's wrong?
Thanks in advance.
iTunes-OTHER, Mac OS X (10.7.2), iPhone 4S, iOS 5, iCloud Sync