This is something unusual I have never heard of:

I made a very important note on my iphone. I needed to rely on this info. I was editing the note in the middle of the page. I hit the back space key once and in front of my eyes it kept deleting everything the top half of my note (letter by letter). I called apple and they said they never heard of it. None the less it happened and the screen and my hands were dry and clean. So I guess I am just shit out of luck, whatever that means.