The way to resolve this, Panic, is to construct your longer answers in Notepad or MS Word - then copy / paste. I've done this for months now, even under the old system because too often I 'lost' messages.
Another way, if that sounds like too much trouble is to highlight the text of your answer BEFORE you send it, press CTL / C , then that saves a cache copy of the text in memory in your PC. Then if the AB system fouls up on sending, you've still got the text stored.
Go back to the Answer screen and press CTL / V to get the text back again.