See other thread ,,,,,,, it covers solution
QUOTE(GeorgeRud @ Dec 23 2011, 01:06 PM)
When I try to reply to topics on my iPad, I often have the reply disappear after typing a line or two. I recently acquired the iPad, and am not sure if I'm hitting something on the touchscreen or is there something else going on. Anyone else have this trouble? It could just be my sloppy typing or fat fingers, but it doesn't happen on my laptop.