@eg500 happens to me sometimes too. I think it has to do with losing your connection to the forum between starting the message and when you send it. Switching to another app, or even just shutting off my phone screen, will cause it to lose connection. When it happens I usually copy my message text to the clipboard & refresh the page, or if that still doesn't work, open a new window & navigate back to where I was. Then I can paste the message in & send it with no interruption.