On all of the sony(or vivatron) monitors that I have seen I notice two grey lines that run horizontal across the screen after the monitor has been on a while. Someone has told me that these are support wires that are holding up the screen. When the monitor has been on a while and gets hot the lines start to show up. Is this true? If so, why pay more money for this 'great' feature? Or is this an old thing that has been fixed? A myth?