What problem do I have?
1. Some tracks are not downloading
2. Some artwork is missing
What have I tried to do to fix the issue? (in no particular order)
1. Deleted all the music > sync > recheck all the music > resync
2. Checked and unchecked "Show All Music' in Settings
3. Logged out off iTunes and iCloud and logged back in.
I can see from some forum questions that this appears to be a common problem but can't find a solution.
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