I'm seeing this exact same problem. Every few seconds/minutes of typing results in a conflict. The "Sync" button is going nuts as I type. It'll start and stop syncing multiple times as I'm typing. My guess is that the timer that waits until you're done typing is off so it tries to sync multiple times as we're typing, thus causing the conflicts. PLEASE fix this. It makes the app work terribly. NOTE: I even changed the Preferences > Sync option to "Manually" to stop these bizarre conflicts and it still tries to synchronize messages automatically.