longform projects should always be first rendered to an image format; that way you don’t lose any extra time if it fails a render. you just fix that one clip and continue rendering.(it also shows you where it stopped) also, you check the crash logs and send them to adobe. or try software render, pre-rendering a h.264 to dhx/prores/image seq, mp3 to wave, disable plugins, check computer temp, as basic troubleshooting. there a few h.264 flavors that are incompatible with premiere, including wrong color gamuts and 8bit lines. I’m actually surprised when anyone tries to render a complicated timeline to a one-go streaming codec.