This is probably more of a bug but,

So I've noticed it's the audio and it doesn't have anything to do with the framerate or how the resolution looks, but higher resolution and fps will make it take longer to render

If this is on Android, this is an issue with hardware compatibility - the phone is not capable of rendering a video.

The best solution would be to use the app on Windows or MacOS.

Some solutions to try on Android:

- Disable audio during rendering - add audio in after rendering

- Try rendering at a lower resolution - 720p