Random songs playing on iPhone XR

I have an iPhone XR and for the past week or so, my phone plays random songs and sometimes podcasts that are not downloaded on my phone and have never been downloaded on there. I don’t even recognize the voices that are playing. Even after I close out of every single app, it still manages to keep playing. The only way I can get it to stop is by shutting my phone all the way down. And turning it back on.