Hi Tiffany,
Thanks! I'm trying to repro it, but still not seeing the same error. A few team members are investigating this internally as well. Any chance you can share the app export as well? If so, please feel free to direct message me! The best way for us to test this particular case would be if you can "Share"->"Showcase"-> and then "Download showcase" (no need to press Submit). The download showcase will export your app with a snapshot of your data. If you're unable to share the data snapshot, a regular JSON export would still be helpful 
Otherwise, I'd try disabling the change handlers to see if that makes a difference.
It might be worth trying the new listView (beta info here) which was built to be more performant.