Downloaded songs randomly deleted

Hi, recently a lot of songs that I play a lot got deleted locally from my iPhone, as in the downloads. When I tap it in offline mode, it says that it isn't available in my country, but turning on networks proves that they're still just fine in the US. A song I've been listening to a lot recently got deleted, so I redownloaded it... and it got deleted again. Optimize Storage for Music is off, and every single song I listen to is available for listening in the United States. It's just deleting the songs. Should I delete and redownload the affected albums? Would buying the albums from the iTunes Store fix it? And has anyone else experienced this?

Thanks for your help in advance.