This has happened to me a few times in the past week, so guessing it's driven by the version, which is 1.5.1.13
I'll be in the middle of a three or four paragraph message. When I stop midway or at the end of a sentence, no matter if I manually move the cursor back down to where I want to add text, it pops up to the top of the final paragraph. To complete the email, I have to copy everything, quit out of the message and start a new message. Of course, as luck would have it, it has happened when I am in a hurry to get a message out, so no screenshots yet. Will add one if I can catch it when not rushing off somewhere.
