cover slides over text message window
when I turn my Iphone 5S sideways to type a text message sometimes a gray cover slides over the text message window. The gray cover has numerals 0:00 on the far right side of the cover. I can't figure out how to get rid of it or prevent it except for re-booting my phone and being very careful where I touch the screen when turning my phone sideways to type another text message.Anyone know how to get rid of this or prevent it in the first place?
iPhone 5s, iOS 9.0.2