In case you want to try a downgrade, follow these steps inspired by How to fix synchronisation issues and start over
- on 3.4.5, export a JEX of all your data (very important step)
- use victor plugin to delete all local data
- sync to delete all data on the sync target
- sync all your other devices to delete their local data
- fully uninstall 3.4.5
- install 3.3.13
- import your JEX
- sync
- enjoy a stable version