Some playlists missing after restore?

[jwflutterby]

Had a new 6s start acting up on me. I managed to get a wired backup to iTunes on my MBP before it completely died. Restored to a 6 I hadn't gotten around to selling yet until I could get to an Apple Store to have them replace the 6s. I noticed when I tried to listen to music on the 6 that a few of my playlists were missing. I buy/download music right on my phone and create my playlists inside the Music app. I had one playlist that I'd created that way that restored and all the songs that were in the other playlists restored, just not the actual playlists. Chalking it up to maybe the unhealthy 6s, I recreated them on the 6. After having Apple swap out the 6s, I went home and did a full backup of the 6 then restored to the new 6s. The same playlists that has come from the old 6s to the 6 also made it from the 6 to the new 6s but the lists I'd lost from the old 6s and recreated on the 6 once again did not restore down to the new 6s... WTH? If no playlists I'd ever created on the phone backed up/restored properly I'd chalk it up to that but that isn't the case. Any idea what I can do to make sure these new lists I keep remaking actually back up and restore?