Hey Pbtchump,
Are you only having this issue while streaming a video or music? If yes, then the issue might be coming from your network. Make sure that you're connected to a strong stable network while streaming. If it happens with downloaded videos or music as well, then let's double check if your iPhone is updated to the latest software: Update your iPhone or iPad
If an update is available and you're having issues updating the device wirelessly, try updating it using your computer:
Update iOS on iPhone
1. Connect iPhone and your computer with a cable.
2. Do one of the following:
* On a Mac (macOS 10.15 or later): In the Finder sidebar, select your iPhone, then click General at the top of the window.
* On a Mac (macOS 10.14 or earlier) or a Windows PC: Open the iTunes app, click the button resembling an iPhone near the top left of the iTunes window, then click Summary.
* Note: Use the latest version of iTunes. See the Apple Support article Update to the latest version of iTunes.
6. Click Check for Update.
7. To install an available update, click Update.
Let us know how it goes!
Best regards.