The app is crashing!
The main cause of crashes in SwiftoDo is integration with file sync providers. Each one acts a little differently, and it can lead to instability sometimes.
If the app is crashing when you are making many changes in short succession, you may be editing the file faster than the todo.txt file sync provider can keep up with. Try to slow down a bit.
If the app is crashing when you complete a task, or make sure the “auto-archive” option is turned off.