This is going to be a little bit difficult to explain but I'll try my best. On occasion when I'm texting someone, the dialogue box populates with a light gray color and within it is what can be described as a timer (0:00). When the dialogue box is filled with this content it is nearly impossible to add any text. The only way I can get rid of this issue is by closing out iMessage and reloading it. It's happened to me quite a few times. I just sold my iPhone 5 to a close friend and he showed me his phone with the same issue. I had to show him how to get rid of it as he is coming from an Android device and was re-learning iOS. Any ideas?