PURCHASED MUSIC DISAPPEARS WHEN I CLICK ON IT?

I have an iPhone 7 and click on music in my library that I bought on iTunes in the past, when I do it disappears completely (when I look on iTunes to see if my phone still recognizes that I own the song it says the price like it was never purchased). Other times I click on a song it says "this title can't be played right now" and turns a light gray but still shows up in my library. How can I fix this?

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