Suddenly just today I have this little white "floating" square that can be moved around the screen. If you tap it a small menu pops up with options like adjust ringer, back, menu, and a few others. I find it anoying and do not know where it came from nor how to get rid of it. Can anyone shed some light on this. Doesn't matter which menu you are in, it is there. I can move it out of the way but it always gets in the way of something else I open. Bottom right corner is the best place so far but I want it gone.