I don't know if this has been posted before.. if it has, sorry. Sometimes when I'm texting I'll be typing and the screen will jump to the very first message of whatever conversation I'm in, so then I'm still able to type but can't see what I'm typing. Then if I turn my phone to landscape, when I try to type it won't work. The letters will light up but it won't type. Then when I turn it back to portait, the conversation usually (but not always) jumps back to the bottom of the screen so I can see what I'm typing again. This is really irritating and happens to me quite often, usually when I'm typing a long message. I don't know if it's a common issue?! I don't remember it happening the first few months I got my phone though.. I got it in July.