Crash upon reaching 50% export when saving online

Create a large, diverse score. Use different soundfonts and possibly effect setting.

Save online, upload score audio.

Occasionally, and seemingly randomly, my Musescore will crash when it reaches exactly 50% in the Exporting progress bar. Not to mention a host of other issues with this function, but perhaps there's an EPIC thread for those. Those could be issues with Musescore.com. But this crash is definitely a program issue.
Eventually the score will upload correctly, but only after many tries and many different bugs. This has happened to me once when I first uploaded the below piece, and twice today when I updated it.