I have a Toshiba DLP, model number 62MX195. It is 5 years old. We have already replaced the bulb which I hear is a common problem for these televisions. But now we have another problem. The bottom half of the screen has an opaque overlay of some sort. We can see the picture behind it, but it is pretty annoying and distracting . It looks like a whitish mesh over the bottom of the screen. Occasionally it goes away on it's own and the picture is normal anywhere from a few minutes to a few days at a time. But the opaque mesh has been on the screen for a better part of the past month. Does anyone know what this could be caused from?