Next time it happens, I’ll make sure to grab the debug log.
Files are stored on local drive (Documents on Mac, “On my iPad/iPhone” on mobile) Not in iCloud, Box, Dropbox, or any sync service. I do not use Documents or Desktop in the Cloud on Mac. Only Obsidian Sync - but this doesn’t seem like a sync issue. It only happens if I change documents quickly (like clicking through days on the Calendar or using the “back” button over and over.