Rush crashes on mobile (iPhone 12 Pro running iOS 15.6.1) on playback and exporting

Rush crashes constantly on my iPhone 12 pro running iOS 15.6.1, especially during playback and exporting files. 

Here's my workflow:

1. Shoot video on Canon EOS M50 Mark II in 4K.
2. Upload footage to Rush desktop app on a MacBook Pro running MacOS Monterey 12.5.1.
3. Allow to upload fully and sync on creative cloud.
4. Open iPhone 12 pro and open project that I started on desktop version.
5. Allow files to load/sync so I can start editing.
6. Start editing and saving periodically.

Since last week, I cannot even press play on a project without the app crashing. Maybe I can get a few seconds in. If I am lucky to finish editing without crashing, I will attempt to export the project and it will either crash immediately or get to like 1-2 percent and crash.

I have been having to do all my work on the desktop app, which works, but I much prefer to work on the mobile app as I find it faster to pinch, tap, swipe etc. I would be so grateful for any help anyone can provide. I edit videos for social media and the mobile app is my lifeblood. I really do not want to have to switch to another mobile editing app.