Mitsubishi WD-73C10 suddenly vertical lines
I have owned this Mitsubishi WD-73C10 Rear Projection TV for several years now and have had no issues until recently. I accidentally left the TV on for 22 hours and when I returned home there were several sets of 4 or 5 vertical lines separated evenly across the screen. When I turned the TV off for a day, the lines disappeared but if I view for a few hours the vertical lines return. Recently, the lines are returning more frequently with less viewing time. Any advise.
I also attached a jpg photo