Hi Joseph,
Thank you for your response. Unfortunately, restarting my phone and force quitting has not resolved the issue. I haven’t experienced it without using headphones but this has only been an issue since I updated to iOS 13. The volume situation has also remained the same. There are a few other bugs I should mention. When I press on a song, I have to wait a few seconds for it to start playing, whereas in iOS 12, the song immediately started. Also, the volume control button used to be remarkably smooth when I would drag it with my finger, but now it is occasionally unresponsive and stiff.
I’m sorry to report so many issues but I was highly impressed with how my phone was working before and now it is behaving rather oddly.
Thank you!