We need a log message of the compose window when the problem appears.
- Go into Preferences/Settings, Shake your iPhone. "Enabled" should show.
- Scroll down and activate 'Debug'.
- Replicate your issue in the composer.
- Shake your iPhone. A menu should appear.
- Select 'Log Message'.
- Wait a few seconds. You should be re-directed automatically to the Debug section.
- Tap on 'Send Logs' and you're done.